The document defines work as the product of force and distance. Work is done when a force causes an object to move in the direction of the force. No work is done if there is no movement. Power is defined as the rate at which work is done, or the amount of work done per unit time. Several examples are provided to demonstrate calculating work and power using the relevant formulas. Horsepower is also defined as a common unit of power equivalent to approximately 746 watts.
This teaching Material is for Grade - 9 Science. Here we are trying to cover Force from Unit 2. We provide teaching material at no cost. Please don't forget to recommend/reference our teaching Material after use.
This teaching Material is for Grade - 9 Science. Here we are trying to cover Force from Unit 2. We provide teaching material at no cost. Please don't forget to recommend/reference our teaching Material after use.
Explain work, energy and power. The Law of Conservation of Energy is utilized as well as conservative and non conservative systems.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Explain work, energy and power. The Law of Conservation of Energy is utilized as well as conservative and non conservative systems.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
How do young people meet when travelling?
How can this be done more effectively?
And how do I maintain the friendships they create when home, is thousands of miles apart?
...
These are important questions that come paired with globalisation, and in an age of social media dominance, I wanted to know, how people were thinking and how we could assist them.
ĐIều Kiện Có Hiệu Lực Của Hợp Đồng Lao Động
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Văn Phòng Luật Sư Số 5:
Website - http://www.vanphongluatsu5.com/
Slideshare - http://goo.gl/mqgqm4
Facebook - http://goo.gl/ZhrCj5
Google Plus - http://goo.gl/
Youtube - http://goo.gl/OeoYHg
Thủ Tục Ly Hôn Có Yếu Tố Nước Ngoài
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Slideshare - Văn Phòng Luật Sư Số 5: http://goo.gl/mqgqm4
Facebook - Văn Phòng Luật Sư Số 5: http://goo.gl/ZhrCj5
Google Plus - Văn Văn Phòng Luật Sư Số 5: http://goo.gl/
Youtube - Văn Phòng Luật Sư Số 5: http://goo.gl/OeoYHg
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
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.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
GIÁO ÁN DẠY THÊM (KẾ HOẠCH BÀI BUỔI 2) - TIẾNG ANH 8 GLOBAL SUCCESS (2 CỘT) N...
Ch14.1 powerpoint
1. 14.1 Work and Power
The weight lifter
applies a large force
to hold the barbell
over his head.
Because the barbell
is motionless, no
work is done on the
barbell.
2. 14.1 Work and Power
When does a force do work?
In science, work is the product of force and
distance.
What Is Work?
3. 14.1 Work and Power
For a force to do work on an object, some of
the force must act in the same direction as
the object moves. If there is no movement,
no work is done.
What Is Work?
Any part of a force that does not act in the
direction of motion does no work on an
object.
4. 14.1 Work and Power
Work is done when a force acts on an object in
the direction the object moves. Work is done
when the weightlifter exerts an upward force to
raise the barbell.
What Is Work?
5. 14.1 Work and Power
Work Requires Motion
The weight lifter does no work on the
barbell as he holds it over his head. The
force applied to the barbell does not
cause it to move.
What Is Work?
6. 14.1 Work and Power
Work Depends on Direction
• If all of the force acts in the same
direction as the motion, all of the force
does work.
• If part of the applied force acts in the
direction of motion, that part of the
force does work.
• If none of the force is applied in the
direction of the motion, the force does
no work.
What Is Work?
7. 14.1 Work and Power
A. All of the force does work on the suitcase.
What Is Work?
Force
Direction of motion
Force and motion
in the same direction
8. 14.1 Work and Power
A. All of the force does work on the suitcase.
B. The horizontal part of the force does work.
What Is Work?
Force
This force
does work
This force
does no
work
Direction of motion Direction of motion
Force and motion
in the same direction
Part of force in
direction of motion
9. 14.1 Work and Power
A. All of the force does work on the suitcase.
B. The horizontal part of the force does work.
C. The force does no work on the suitcase.
What Is Work?
Force
This force
does work
This force
does no
work
Force
Direction of motion Direction of motion Direction of motion
Force and motion
in the same direction
Part of force in
direction of motion
Lifting force not
in direction
of motion
11. 14.1 Work and Power
Units of Work
When using SI units in the work formula,
the force is in newtons, and distance is
in meters.
The joule (J) is the SI unit of work. A
joule is equal to 1 newton-meter.
Calculating Work
12. 14.1 Work and Power
Using the Work Formula
A weight lifter raises a 1600-newton
barbell to a height of 2.0 meters.
• Work = Force × Distance
• Work = 1600 N × 2.0 m
• Work = 3200 N·m = 3200 J
Calculating Work
13. 14.1 Work and Power
How are work and power related?
Power is the rate of doing work.
What Is Power?
Doing work at a faster rate requires more
power. To increase power, you can increase
the amount of work done in a given time, or
you can do a given amount of work in less
time.
14. 14.1 Work and Power
Work is required to move snow from one
location to another. A person using a shovel
and a person using a snow blower can both do
the work needed to remove the snow.
The snow blower can do the job much faster
because it has more power.
What Is Power?
15. 14.1 Work and Power
Because the snow blower can remove more
snow in less time, it requires more power than
hand shoveling does.
What Is Power?
17. 14.1 Work and Power
When using SI units in the power formula,
work is measured in joules (J), and time is
measured in seconds (s).
The SI unit of power is the watt (W), which is
equal to one joule per second.
Calculating Power
18. 14.1 Work and Power
Calculating Power
You exert a vertical force of 72 newtons to lift a
box to a height of 1.0 meter in a time of 2.0
seconds. How much power is used to lift the box?
Calculating Power
19. 14.1 Work and Power
Read and Understand
What information are you given?
Calculating Power
20. 14.1 Work and Power
Read and Understand
What information are you given?
Calculating Power
21. 14.1 Work and Power
Plan and Solve
What formula contains the given quantities
and the unknown?
Calculating Power
22. 14.1 Work and Power
Plan and Solve
What formula contains the given quantities
and the unknown?
Calculating Power
23. 14.1 Work and Power
Plan and Solve
Replace each variable with its known value
and solve.
Calculating Power
24. 14.1 Work and Power
Plan and Solve
Replace each variable with its known value
and solve.
Calculating Power
25. 14.1 Work and Power
Look Back and Check
Is your answer reasonable?
Calculating Power
26. 14.1 Work and Power
Look Back and Check
Is your answer reasonable?
36 watts is not a lot of power, which seems
reasonable considering the box was lifted
slowly, through a height of only 1 meter.
Calculating Power
27. 14.1 Work and Power
1. Your family is moving to a new apartment.
While lifting a box 1.5 m straight up to put it on
a truck, you exert an upward force of 200 N for
1.0 s. How much power is required to do this?
Calculating Power
28. 14.1 Work and Power
1. Your family is moving to a new apartment.
While lifting a box 1.5 m straight up to put it on
a truck, you exert an upward force of 200 N for
1.0 s. How much power is required to do this?
Answer: Work = Force × Distance =
200 N × 1.5 m = 300 J
Power = Work/Time = 300 J/1.0 s = 300 W
Calculating Power
29. 14.1 Work and Power
2. You lift a book from the floor to a bookshelf
1.0 m above the ground. How much power is
used if the upward force is 15.0 N and you do
the work in 2.0 s?
Calculating Power
30. 14.1 Work and Power
2. You lift a book from the floor to a bookshelf
1.0 m above the ground. How much power is
used if the upward force is 15.0 N and you do
the work in 2.0 s?
Answer: Work = Force × Distance =
15 N × 1.0 m = 15 J
Power = Work/Time = 15 J/2.0 s = 7.5 W
Calculating Power
31. 14.1 Work and Power
3. You apply a horizontal force of 10.0 N to pull
a wheeled suitcase at a constant speed of 0.5
m/s across flat ground. How much power is
used? (Hint: The suitcase moves 0.5 m/s.
Consider how much work the force does each
second and how work is related to power.)
Calculating Power
32. 14.1 Work and Power
3. You apply a horizontal force of 10.0 N to pull
a wheeled suitcase at a constant speed of 0.5
m/s across flat ground. How much power is
used? (Hint: The suitcase moves 0.5 m/s.
Consider how much work the force does each
second and how work is related to power.)
Answer:
Work = Force × Distance =
10.0 N × 0.5 m = 5 J
Power = Work/Time = 5 J/1.0 s = 5 W
Calculating Power
33. 14.1 Work and Power
Another common unit of power is the
horsepower. One horsepower (hp) is equal
to about 746 watts.
James Watt (1736-1819) was looking for a
way to compare the power outputs of steam
engines he had designed. Horses were a
logical choice for comparison as they were
the most commonly used source of power in
the 1700s.
James Watt and Horsepower
34. 14.1 Work and Power
The horse-drawn plow and the gasoline-
powered engine are both capable of doing
work at a rate of four horsepower.
James Watt and Horsepower
35. 14.1 Work and Power
Assessment Questions
1. In which of the following cases is work being done
on an object?
a. pushing against a locked door
b. suspending a heavy weight with a strong chain
c. pulling a trailer up a hill
d. carrying a box down a corridor
36. 14.1 Work and Power
Assessment Questions
1. In which of the following cases is work being done
on an object?
a. pushing against a locked door
b. suspending a heavy weight with a strong chain
c. pulling a trailer up a hill
d. carrying a box down a corridor
ANS: C
37. 14.1 Work and Power
Assessment Questions
2. A tractor exerts a force of 20,000 newtons to
move a trailer 8 meters. How much work was
done on the trailer?
a. 2,500 J
b. 4,000 J
c. 20,000 J
d. 160,000 J
38. 14.1 Work and Power
Assessment Questions
2. A tractor exerts a force of 20,000 newtons to
move a trailer 8 meters. How much work was
done on the trailer?
a. 2,500 J
b. 4,000 J
c. 20,000 J
d. 160,000 J
ANS: D
39. 14.1 Work and Power
Assessment Questions
3. A car exerts a force of 500 newtons to pull a boat
100 meters in 10 seconds. How much power does
the car use?
a. 5000 W
b. 6000 W
c. 50 W
d. 1000 W
40. 14.1 Work and Power
Assessment Questions
3. A car exerts a force of 500 newtons to pull a boat
100 meters in 10 seconds. How much power does
the car use?
a. 5000 W
b. 6000 W
c. 50 W
d. 1000 W
ANS: A
41. 14.1 Work and Power
Assessment Questions
4. One horsepower is a unit of power equal to
a. 0.746 W.
b. 1.0 W.
c. 746 W.
d. 2,000 W.
42. 14.1 Work and Power
Assessment Questions
4. One horsepower is a unit of power equal to
a. 0.746 W.
b. 1.0 W.
c. 746 W.
d. 2,000 W.
ANS: C
