This document provides a lesson on motion in one direction. It includes definitions of key terms like speed, velocity, acceleration, distance, displacement, and average speed. Concepts are explained through examples and problems. Formulas are provided to calculate values like total distance, average speed, and velocity given information about an object's motion in terms of distances covered and time intervals. Graphs are used to represent motion concepts visually. The document distinguishes between scalar and vector quantities as they relate to physical motion.
In this relative motion and relative speed concept is demonstrated with help of examples, graphically and mathematically. The concepts of Einstein and Galileo
In this relative motion and relative speed concept is demonstrated with help of examples, graphically and mathematically. The concepts of Einstein and Galileo
Angular Motion Contents 1 Angular Motion 3 1.1 Rigid Body 3 1.1.1 Axis of Rotation . 3 1.1.2 Moment of Force . 4 1.1.3 Equilibrium & Stability . 7 1.1.4 Equilibrium Point 8 1.1.5 Equilibrium of Moment of Force 9 1.1.6 Center of Mass 10 Reduction Method 11 Vector Form . 14 Cartesian Method 15 Calculus Method . 18 Sign Conventions . 19 Objects of Non-Homogeneous Form 20 Homogeneous Object With Varying Density 24 1.1.7 Radius of Gyration 24 1.1.8 Center of Gravity . 27 Reduced Mass 28 1.2 Angular Motion 28 1.2.1 Angular Velocity . 29 1.2.2 Linear Velocity & Angular Velocity . 29 1.2.3 Linear & Angular Accelerations . 30 1.2.4 Angular Momentum - Moment of Momentum . 30 1.2.5 Rolling of Object . 35 1.2.6 Angular Motion In Inclined Plane . 36 1.2.7 Power in Rotational Motion . 38 1.3 Inertia . 38 1.3.1 Moment of Inertia 39 1.3.2 Law of Inertia . 39 Law of Parallel Axis . 39 Law of Perpendicular Axis 42 1.3.3 Relation Between Torque and Inertia 43 1.3.4 Moment of Inertia of Rod 45 1.3.5 Moment of Inertia of Rectangular Body 49 1.3.6 Moment of Inertia of Ring 50 1.3.7 Moment of Inertia of Disk 50 1.3.8 Moment of Inertia of Solid Sphere . 53 1.3.9 Moment of Inertia of Cylinder . 56 1.4 Energy . 66 1.4.1 Angular Kinetic Energy .
Principle of Angular Motion - Physics - An Introduction by Arun Umraossuserd6b1fd
Notes for angular motion. Contains sections related to angular motion, angular velocity, center of gravity, center of mass, force constant, inertia, inertia about axis, inertia about center, many body problems, omega, parallel axis rule, perpendicular axis rule, rolling, rotation, scalar product, sliding, torque, vector product
"Motion and You" is a PowerPoint for primary and secondary students that provides an overview of motion and speed - highlighting how to describe and measure both. Additionally, this lesson can be paired with the following activities: Gum Chomp, Speed Challenge or Ladar Guns.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
1. Lesson one
I) Complete the following statements :
1. The …………….. is the speed of moving object relative to the observer .
2. The total distance that a moving object covers divided by the total time taken
to cover this distance is known as ………………..
3. The uniform speed of a car is 90 km/hour,
4. When the average speed of an object equals the uniform speed
motion represents ………
5. The relative speed of moving object depends on ………
II) Write the scientific term :
1. The distance that a moving object covers within a unit time . […….…
2. The speed in which the object moves to cover equal distances at equal periods
of time .
3. The change in the position of a body by time relative to the position of another
body . [………….…..]
4. The simplest type of motion .
III) Put ( √ ) or ( × ) then correct what is wrong :
1. When a moving object covers equal distances at equal periods of time so it
moves with uniform acceleration
2. A car moves with regular speed covers 500 met
3. Average speed is the speed of a moving object relative to the observer ( )
4. Measuring the relative speed for a moving car d
speedometer which determines the speed value.
5. The relative speed of two moving bodies in the same direction equals the su
their speed .
Cairo Governorate
Nozha Directorate of Education
Nozha Language Schools
Ismailia Road
1
Unit one
Lesson one: Motion In One Direction
I) Complete the following statements :
the speed of moving object relative to the observer .
The total distance that a moving object covers divided by the total time taken
to cover this distance is known as ………………..
niform speed of a car is 90 km/hour, its speed equals ………… m/s .
4. When the average speed of an object equals the uniform speed
motion represents ……………… motion .
5. The relative speed of moving object depends on ……………….
II) Write the scientific term :
distance that a moving object covers within a unit time . […….…
The speed in which the object moves to cover equal distances at equal periods
The change in the position of a body by time relative to the position of another
body . [………….…..]
The simplest type of motion .
) then correct what is wrong :
1. When a moving object covers equal distances at equal periods of time so it
moves with uniform acceleration
h regular speed covers 500 meters in 20 sec. its speed is 200 m/s
Average speed is the speed of a moving object relative to the observer ( )
Measuring the relative speed for a moving car depends on the presence of
which determines the speed value.
The relative speed of two moving bodies in the same direction equals the su
their speed .
Motion In One Direction
the speed of moving object relative to the observer .
The total distance that a moving object covers divided by the total time taken
speed equals ………… m/s .
4. When the average speed of an object equals the uniform speed , in this case the
…….…………..
distance that a moving object covers within a unit time . […….….……..]
The speed in which the object moves to cover equal distances at equal periods
[………..……..]
The change in the position of a body by time relative to the position of another
body . [………….…..]
[……………...]
1. When a moving object covers equal distances at equal periods of time so it
( )
ers in 20 sec. its speed is 200 m/s
Average speed is the speed of a moving object relative to the observer ( )
the presence of
( )
The relative speed of two moving bodies in the same direction equals the sum of
( )
Department : Science
Form : 3rd
prep
Revision sheet
2. 2
IV) Give reasons for :
1. The moving car seems stable to an observer moves with the same speed and
direction .
……………………………………………………………………………………
2. The uniform speed of a car can’t be obtained practically .
……………………………………………………………………………………
V) Define each of the following :
(1) Speed :…………………………………………………………………………….
(2) Irregular speed: …………………………………………………………………….
VI) Problem
1-A runner covered a distance of 100 meters to the north in 30 seconds , then 50
m to the east in 10 seconds , then 100 meters to the south in 15 seconds , then he
came back again to the starting point in 5 seconds . calculate .
a. The total distance covered by the runner .
……………………………………………………………………………..
b. The average speed of the runner .
…………………………………………………………………………….
2- A body covers a distance of 24 Km through 4 minutes then it covers 7.2 Km
through 3 minutes .
Calculate the average speed
………………………………………………………………………………………
....……………………………………………………………………………………
3. 3
Lesson Two
Graphic Representation of moving in a straight line
I) Complete :
1. The value of change of an object’s speed in one second is ………………..
2. When an object moves with decelerating motion this means that its ………….
speed is greater than its ……………. Speed .
3. For a car moves with a regular speed , the ratio d / t is ………………
4. The ratio between the final speed and initial speed for an object moves with
accelerating motion is …………….. one .
II) Write the scientific term :
1. The graph for a regular motion at uniform speed which is represented by a
straight line parallel to the ( ×) axis . [………..……….….]
2. The change of the object’s speed by equal values through equal period of time .
[…………………….]
3. The graph for a regular motion at uniform speed which is represented by a straight
line passes through – the origin point . […………………….]
III) What’s the difference between :
1. Speed – acceleration ( Definition – measuring unit )
……………………………………………………………………………………….
……………………………………………………………………………………….
2. The graphical relation ( distance – time ) and the graphical relation (speed – time)
for regular motion in a straight line at constant speed .
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
4. IV) What is meant by :
A body moves with acceleration equals zero
………………………………………………………………………………………..
V)-Problem :
1) A racing car starts moving from the rest
through 5 second . Calculate
………………………………………………………………………………………..
………………………………………………………………………………………..
2) A car moves at speed 100 m/sec
5 m /sec2
. Calculate the car’s speed
………………………………………………………………………………………..
………………………………………………………………………………………..
VI) Which of the graphs represents :
(A)
1- A body moves with regular speed.
2- A body moves with irregular speed.
1- A body at rest.
VII) The opposite graph represents the motion of car :
Which part represents the motion with.
1- Zero acceleration.
2- Negative acceleration.
3- Positive acceleration.
Distance Distance
Time
4
A body moves with acceleration equals zero.
………………………………………………………………………………………..
car starts moving from the rest. Then its speed increased to 90
Calculate the acceleration of the moving car .
………………………………………………………………………………………..
………………………………………………………………………………………..
ed 100 m/sec . if the driver reduces its speed by a rate of
the car’s speed after 12 seconds.
………………………………………………………………………………………..
………………………………………………………………………………………..
) Which of the graphs represents :
(B)
regular speed.
A body moves with irregular speed.
VII) The opposite graph represents the motion of car :
Which part represents the motion with.
Distance Distance
Time
………………………………………………………………………………………..
Then its speed increased to 90 m/s
the acceleration of the moving car .
………………………………………………………………………………………..
………………………………………………………………………………………..
if the driver reduces its speed by a rate of
………………………………………………………………………………………..
………………………………………………………………………………………..
(C)
Distance
Time
5. 5
Lesson three
Physical Quantities scalars and vectors
I) Complete the following :
1. The distance is a ……..…… quantity while displacement is a …………. quantity .
2. ……...…… is the covered distance in a constant direction and is a vector quantity .
3. When a body moves in a straight line in one direction , its distance covered by the
body is ………….. its displacement .
II) What’s the difference between :
1-Distance and displacement ( Definition only ) .
………………………………………………………………………………………….
………………………………………………………………………………………….
2- Scalar quantity and vector quantity ( Definition and Examples ) .
…………………………………………………………………………………………
…………………………………………………………………………………………
III) What is meant by :
1. The displacement of on object is 60 meters in east direction .
………………………………………………………………………………………….
2. The average velocity of a moving car is 80 km /h
………………………………………………………………………………………….
IV) When dose the following cases happen :
1. The displacement covered by a moving body equals zero .
…………………………………………………………………………………………
2. The distance and displacement of a moving object are equal .
……………………………………………………………………………………………………..
6. 6
V) Problem :
1- A tennis ball falls from a height of 30 m in 4sec. then it rebounds from the ground
to upward a distance of 5 m in 1sec . Find the distance covered by the ball and
the displacement then Calculate the average speed and velocity .
………………………………………………………………………………………..
………………………………………………………………………………………….
………………………………………………………………………………………….
2- If a body starts its motion from point (a) covered 20 meters northward till point (b)
within 20 seconds , then 50 meters eastward till point (c) within 10 seconds then
20 meters southward till point (d) within 5 seconds. Calculate
i) The average speed ii)The velocity
………………………………………………………………………………………….
………………………………………………………………………………………….
3- A body moves in a circular path , starting from the point A to B to C to D and
returns back to the start point (A) . If the circumference of the path is 200 meters
and the body covered the distance (ABC) within 10 seconds . then it covered the
distance (CDA) within 20 seconds. calculate :
a) The total distance the body moved.
………………………………………………………………………………………
b) The average speed of the body .
………………………………………………………………………………………
c) The displacement .
………………………………………………………………………………………
c) The velocity .
………………………………………………………………………………………
7. 7
4- A body moved from ( A ) to ( B ) into ( C ) as the drawing .
Therefore
1- The distance covered by the body = ………………………
2- Its displacement = ……………………………
3- The average speed = ……………………………
VI) Give reasons for :
1. Velocity and acceleration are vector quantities . while distance and length are
scalar quantities .
………………………………………………………………………………………..
………………………………………………………………………………………..
2. Pilots take in consideration the velocity of the wind .
………………………………………………………………………………………….
………………………………………………………………………………………….
VII) Write the scientific term :
1. The length of shortest straight line between primary position and final position .
[………………….……]
2. The rate of change of displacement . […………………….…]
3. The vector quantity which is measured in m/s2 .
[………………….……]
4. It is from the starting point towards the ending point [………………….……]
ab
c
60 m
80 m
4 s
6 s
8. 8
Unit Two
Lesson one: Mirrors
I) Write the scientific term :
1.Rebounding of light to the same side when it strikes a reflecting surface .
[…………………….…]
2. The angle between the incident light ray and the perpendicular line on the
reflecting surface . [……………………….]
3. Angle of incidence = Angle of reflection . […………….…………]
4. The point of collection of parallel light rays to the principal axis of the concave
mirror . [………………………..]
5. Twice the focal length of a spherical mirror . [………………..………]
6. The distance between the center of curvature and any point on the reflecting
surface . [………………………..]
II) Put ( √ ) or ( × ) in front of the following statements and correct the false ones
1. If the distance between the object and a plane mirror is 3m , th the distance
between the object and its image is 3 m . ( )
2. When the angle between the incident ray and the plane mirror surface is 60º , so
the angle of reflection is 50º . ( )
3. The formed image for a body put in front of a convex mirror is virtual , inverted
and smaller . ( )
4. A spherical mirror of diameter equals 14 cm , its focal length is 6 cm .( )
5. The focus is the point that is in the middle of the reflective surface of the mirror .
( )
9. 9
III) : If a body is put in front of a plane mirror at a distance 8 meters , then it
moves toward the mirror for 1 meter .
-What is the distance between the body and its image in the first case?
- What is the distance between the body and its image in the second case?
IV) Give reasons for :
1. Concave mirror is used in cooking by using solar energy .
………………………………………………………………………………………….
………………………………………………………………………………………….
2. A convex mirror is put at the left side of the driver of the car .
………………………………………………………………………………………….
………………………………………………………………………………………….
3. The incident light ray falling perpendicular on a reflecting surface reflects on itself
………………………………………………………………………………………….
………………………………………………………………………………………….
4. The word “AMBULANCE” is written in a converted way on the ambulance car.
…………………………………………………………………………………………
…………………………………………………………………………………………
V) Show by drawing the path and the direction of rays in the following cases :
• An object in front of a concave mirror at a distance less than its focal length
( Determine the properties of the formed image )
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
10. • The image that is formed by the convex mirror .
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
• An object in front of a concave mirror at a distance of 7 cm . Knowing that its
focal length is 5 cm .
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
VI) An object was put at a distance 20 cm from a mirror
a screen where its length equal to the
(1) What is the type of the mirror .
………………………………………………………………………………………….
(2) Calculate the focal length of the mirror .
………………………………………………………………………………………….
(3) Draw the path rays that shows the formation of this image .
……………………………………………………………………………………
…………………………………………………………………………………………
VII) Complete the drawing
10
The image that is formed by the convex mirror .
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
An object in front of a concave mirror at a distance of 7 cm . Knowing that its
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
put at a distance 20 cm from a mirror, the image is formed
equal to the object .
(1) What is the type of the mirror .
………………………………………………………………………………………….
(2) Calculate the focal length of the mirror .
………………………………………………………………………………………….
(3) Draw the path rays that shows the formation of this image .
……………………………………………………………………………………
…………………………………………………………………………………………
drawing :
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
An object in front of a concave mirror at a distance of 7 cm . Knowing that its
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
the image is formed on
………………………………………………………………………………………….
………………………………………………………………………………………….
(3) Draw the path rays that shows the formation of this image .
…………………………………………………………………………………………
…………………………………………………………………………………………
11. 11
Lesson (2): Lenses
I) Complete the following statements :
1. A point inside the lens on the principal axis in the mid distance between its faces is
……………………… .
2. The radius of the convex lens = 12 cm , Its focal length = …………… cm
3. The long sighted person needs a medical eye glasses with ………..……. Lenses .
4. The optical piece that forms an equal inverted image of the body is the …………..
5- The virtual image is formed by …………. or ……………. mirrors while it is
formed through ……….. lens.
II) Write the scientific term :
1. The line joining between the two centers of curvature of the lens and passing
through the optical center . [………………………]
2. A vision defect results due to the formation of the image in front of retina .
[………………………]
3. The lenses that are used instead of glasses and can stick to the eye cornea .
[………………………]
4. A disease infects the eye lens , so it becomes dark . [………………………]
III) Give reasons for :
1. The convex lens has two foci , but the concave mirror has one focus .
…………………………………………………………………………………………
…………………………………………………………………………………………
2. The short–sightedness is treated by using a concave lens .
…………………………………………………………………………………………
…………………………………………………………………………………………
12. 12
3. It’s impossible to obtain a real image by using a concave lens .
…………………………………………………………………………………………
………………………………………………………………………………………..
4. The convex lens is called “converging lens” while the concave lens is called
“diverging lens” .
…………………………………………………………………………………………
…………………………………………………………………………………………
IV) What happens when :
1. A light ray is incident parallel to the principal axis of the convex lens .
…………………………………………………………………………………………
…………………………………………………………………………………………
2. The eye lens is too convex .
………………………………………………………………………………………..
3. A light ray passes through the optical center of the lens .
…………………………………………………………………………………………
…………………………………………………………………………………………
V) Define each of the following :
1. The lens .
………………………………………………………………………………………….
2. The center of curvature of the lens face .
…………………………………………………………………………………………
3. Short sight defect .
…………………………………………………………………………………………
13. 13
VI) Problem :
1. A concave lens has a focal length equals 3 cm . An object is placed at a distance of
4 cm . From the lens , determine the position of the formed mage and its properties
by drawing the light rays .
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
2. A convex lens . its focal length equals 5 cm. An object is placed at a distance 7 cm
from the lens , Determine the position of the formed image and its properties by
drawing only two light rays .
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
3. Mention the position and properties of the image formed of an object is put at a
distance less than the focal length .
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
4. A convex lens with focal length of 20 cm an object was placed at a distance of 40
cm from the lens . Assign the distance of object’s image from the lens and
mention its properties .
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
VII)- Complete the following figures:
14. 14
Unit Three
Lesson 1: The universe
I) Write the scientific term :
1. The sun and eight planets revolving around it . […………………….]
2. It’s located in one of the spiral arms of the Milky way galaxy .
[…………….……….]
3.It contains all the stars we see at night in the sky . [……………………..]
4. The distance that is covered by light in one year . [……………………..]
5- The wide and extended apace that contains all galaxies , stars , planets and
everything [……………………..]
II) Give reasons for :
1. Our galaxy is called “ milky way” galaxy .
…………………………………………………………………………………………
…………………………………………………………………………………………
2. The continuous expansion of the space .
…………………………………………………………………………………………
…………………………………………………………………………………………
3. The gravity has important role in cosmogony of the universe .
…………………………………………………………………………………………
…………………………………………………………………………………………
III) Complete the following statements :
1. Each galaxy has a distinctive shape according to ……………. and …………. of the
groups of starts in universe .
2. The solar system is located in one of the spiral arms of …………..……. galaxy .
15. 15
3. Within minutes of the Big Bang , the atomic particles merged together producing
……………… and …………………….. .
4. The solar system contains a number of …..………… orbit the sun .
5. The sun takes about ……………. million years to complete one rotation around the
center of the galaxy .
6. Bigger units of the universe are ……………….
7. The gases that produces galaxies , stars and universe are ………..…. and
……………….
16. 16
Lesson 2: The solar system
I) Complete the following :
1. The force of attraction between two objects is ………………… proportional to the
product of their masses and is ……………… proportional to the square of the
distance between them .
2. The …………….. rotates around the Earth in a fixed orbit and …………… rotates
around the sun once every Earthly day .
3. The scientist who established ……...………… theory is Laplace , but the scientist
who established the modern theory of the world is …………………….
4. The longest day is on …………….. where the shortest day is on ……….………
5. …………….. rotates around the sun once every 12 Earthly years .
II) Write the scientific term :
1. The time taken by the planet to complete one rotation around its axis .
[…………..………]
2. A flat gaseous round disk that formed the solar system . […………………..]
3. The force that keeps the continuity of the planets rotation in their orbits around
the sun . [……………..……..]
4. The planet that has the shortest year on its surface . [……………………]
III) Correct the underline words :
1. The modern theory for formation of the solar system according to Laplace is due
to explosion of a star rotating around the sun .
2. The time of revolving Venus planet around its axis is one Earthly day .
17. 17
3. The difference of day length from a planet to another is due to the speed of the
planet rotation around the sun .
IV) What would happen ?
1. When the distance between a planet and the sun increases .
…………………………………………………………………………………………
…………………………………………………………………………………………
2. Due to the difference in speed of planet rotation around its axis .
…………………………………………………………………………………………
…………………………………………………………………………………………
V) Explain the evolution of the solar system as the vision of the French scientist
“Laplace”
…………………………………………………………………………………………
…………………………………………………………………………………………
V)- Give reason for :
1- The day in Venus is longer that its year .
…………………………………………………………………………………………
…………………………………………………………………………………………
VI)- Discus the factors the affect :
- The length of the planet's day .
…………………………………………………………………………………………
………………………………………………………………………………………….
- The length of the planet's year .
…………………………………………………………………………………………
………………………………………………………………………………………….
- The gravitational force between two space bodies.
…………………………………………………………………………………………
………………………………………………………………………………………….
18. 18
Unit Four
Lesson 1: Cell Division
I) Put ( √ ) or ( × ) in front of the following statements and correct the false ones
1. The chromosome consists of a nucleic acid called RNA and protein. ( )
2. In the mitotic division , the spindle fibers are formed during interphase and
disappear in anaphase . ( )
3. The spindle fibers are formed in the plant cell from the centrosome . ( )
4. The nucleolus disappears through telophase of mitosis . ( )
5. Crossing over phenomenon occurs in the anaphase of first meiosis. ( )
II) Give reason for :
1. The nucleus is the part of the cell division .
…………………………………………………………………………………………
…………………………………………………………………………………………
2. Cellular division begins with interphase .
…………………………………………………………………………………………
…………………………………………………………………………………………
3. Crossing over is the source of genetic variation between members of the same
species .
………………………………………………………………………………………
………………………………………………………………………………………
III) Write the scientific term :
1- The phase in which the chromosomes are arranged at the middle of the cell during
the division […………………]
2. The point of connection of two chromatids together . […………............]
3. It contributes in genes exchanging between the chromosome’s chromatids and
distributing them in the gametes . [………………….]
4. A phase where some processes occur upon which formation of two cells each of
them contains chromosomes that equal in number with the parental cell […….....]
19. IV) If you have a plant that its cells have 20 chromosomes .
What is the number of chromosomes in the following cells ?
(1) leaf (2) ovum
(4) fertilized ovum (5) stem
V) From the following graphs answer the following questions
40 chromosomes
mother cell resulting cells
- Which graph represents mitosis
……………………………………………………………………………………….
- Which graph represents meiosis
……………………………………………………………………………………….
- What is the no. of the chromosomes in the resulting cells in each division .
…………………………………………………………………………………………
VI)- Name these stages of mitotic division:
19
IV) If you have a plant that its cells have 20 chromosomes .
What is the number of chromosomes in the following cells ?
(2) ovum (3) pollen grain
(5) stem (6) zygote
V) From the following graphs answer the following questions
40 chromosomes
other cell resulting cells mother cell resulting cells
mitosis division ?
……………………………………………………………………………………….
Which graph represents meiosis division?
……………………………………………………………………………………….
What is the no. of the chromosomes in the resulting cells in each division .
…………………………………………………………………………………………
Name these stages of mitotic division:
IV) If you have a plant that its cells have 20 chromosomes .
grain
(6) zygote (7) root
V) From the following graphs answer the following questions
40 chromosomes
resulting cells
……………………………………………………………………………………….
……………………………………………………………………………………….
What is the no. of the chromosomes in the resulting cells in each division .?
…………………………………………………………………………………………
20. 20
Lesson 2: Sexual and asexual reproduction
I) Write the scientific term :
1- A type of reproduction that occurs in the higher organisms. […………….…]
2- The ability of some animals to compensate their missing parts. [……………….]
3- It is formed as a result of the combination of the male gamete and the female
gamete . [……………….]
II) Give reasons for :
1. Spore propagation is a type of asexual reproduction which is common in some
fungi such as bread mould and mushroom .
…………………………………………………………………………………………
…………………………………………………………………………………………
2. The zygote has the same no . of chromosomes of cells of parental organism .
…………………………………………………………………………………………
…………………………………………………………………………………………
3. Starfish continues alive even a part of its body is cut .
…………………………………………………………………………………………
…………………………………………………………………………………………
4. Sexual reproduction is a source of the genetic variation .
…………………………………………………………………………………………
…………………………………………………………………………………………
III) Mention the importance of :
1. The sexual reproduction in concerning of the genetic structure .
……………………………………………………………………………………….
2. Vegetative reproduction .
……………………………………………………………………………………….
21. 21
IV) What would happen :
1. separating a starfish arm , while it contains a part of the central disc .
…………………………………………………………………………………………
…………………………………………………………………………………………
2. Fusion of sperm with an ovum .
…………………………………………………………………………………………
…………………………………………………………………………………………
V) How does each of the following organisms reproduces
( if it is asexually reproduction , mention its typ )
1- sponge : ………………………. 2- man: ………………………………..
3- Bacteria:………………………. 4- Hydra: ……………………………..
5- Bread mould:…………………. 6- Paramecium: ………………………
7- starfish :………………………..
8- Plants ( with no need of seeds ): …………
22. 22
Model exam
Question [ 1 ] A) Write the scientific term :
1- The point of the collection of the parallel light rays after being reflected from the
concave mirror . [……………………..]
2- The length of the shortest straight line between two positions . [……………………..]
3- The image that can be received on a screen . [……………………..]
4- The speed of a moving object relative to an observer . [……………………..]
B) In the opposite figure : C
A body starts its motion from point (A) to the west into (B)
to cover 12 meters through 5 seconds then it moves to the 16m 20 m
north into ( C ) to cover 16 meters through 9 seconds .
Calculate :
1- The total distance . 2- Average velocity
C) Give one use ( at least ) for each of the following :
1- A convex mirror. 2- The speedometer .
Question [ 2 ] A) Complete the following statements :
1- ………………….. is the straight line that passes through the center of curvature and
any point on the reflecting surface except the pole .
2- The result of dividing the total distance that a moving object covers by the total time
taken to cover this distance = ……………………………………
3- The measuring unit of the displacement is ……………………..
4- …………………..and ………………….. are the two factors necessary for the
description of motion .
5- When a person moves towards a plane mirror for 2 meter , the distance between his
body and the image decreases by ………………… meters .
6- ………………….. is the physical quantity that has magnitude only .
B) What is meant by :
1- Light reflection . 2- Radius of curvature = 12 cm
3- A moving train covers 100 kilometers in two hours .
B 12 m A
23. 23
Question [ 3 ] A) Put (√ ) or ( × ) :
1- Mass , energy and force are considered as examples of vector physical quantities . ( )
2- When the body moves with a uniform acceleration , it means that it covers equal
Distances at equal periods of time . ( )
3- The body that moves with speed 90 km/H is faster than that moves with speed
25 m/second . ( )
4- The reflected light ray is the ray that falls on the reflecting surface . ( )
5- Pole of the mirror is a mid point on the reflecting surface of the spherical mirror. ( )
B) What is meant by the following graphs :
speed (m/sec) distance (m) speed (m/sec)
T(sec) T(sec) T(sec)
1)………………….. 2)……………………. 3)…………………….
C) Show by drawing:
The path of light rays of the formed image for an object in front of a concave mirror at a
distance less than double of focal length but more than focal length .
( Determine the properties of the formed image ) .
Question [ 4 ] A) Choose the correct answer :
1- A car moves with speed 100 m/sec , if the driver reduces its speed by the rate -3 m/sec2
, the car’s speed after 20 seconds equals …………… m/sec.
a) 160 b) -40 c) 40 d) 60
2- If the angle between the incident light ray and the reflecting surface is 40° , then the
angle of reflection = ………………….
a) 40° b) 50° c) 90° d) 150°
3- ……………… is the change of an objects position as the time passes according to the
position of another object .
a) Displacement b) Speed c) Acceleration d) Motion
4- When a body of height 6 cm is put at a distance 14 cm in front of a convex mirror of
radius 20 cm , the height of its image will be ………….. cm
a) 4 b) 8 c) 6 d) no correct answer
b) Complete the following drawings :
1) …………………………….. 2) ……………………………..
C FC F