The document discusses forces, balanced and unbalanced forces, and calculating resultant forces. It defines a force as a push or pull and notes they have both magnitude and direction. Balanced forces are equal in size but opposite in direction and do not cause a change in motion, while unbalanced forces cause a change in motion. To calculate a resultant force, you take the difference between two forces acting in opposite directions. The document provides examples of calculating resultant forces and determining the direction of motion based on whether the forces are balanced or unbalanced.
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction.
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction.
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction.
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction.
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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.
2024.06.01 Introducing a competency framework for languag learning materials ...
science8 forces and motion.pptx
1. REVIEW:
• Force
• Motion
• Effects of forces on the object’s motion
• Forces on objects at rest
• Normal force
• Friction
• Gravitational force
• Scalar quantity
• Vector quantity
2. True or False
If an object is at rest,
no forces are acting upon it
3. Answer: False
There are many forces acting on it
(gravity, friction, air pressure, etc)
but they are all BALANCED
8. TODAY’S LESSON
Learning Objective
Aim high - Be able to represent forces using a force diagram
Aim higher - Describe the effect that balanced and unbalanced forces
have on an object
Aim even higher - Be able to calculate the size of the resultant force
Key Words:
Balanced force
Unbalancedforce
Resultant or Net Force
9. What is a force?
• A force is a push or pull that causes an object to
move, stop, or change direction
• In physics a force is anything that makes an object
accelerate
10. Force
• Forces come in pairs
• Forces have a magnitude and a direction
5N, north (up)
Magnitude: 5N
Direction: north (up)
11. Balanced and Unbalanced Forces
• Forces occur in pairs and they can be
either balanced or unbalanced
12. Balanced Forces
• Balanced forces do not cause change in
motion
• They are equal in size and opposite in
direction
14. We call this NORMAL FORCE. The book is
said to be at equilibrium since there are no
unbalanced forces acting upon the book
and it maintains its state of motion (it still
sits on the table).
15. Lets say you are
standing on the
ground. Since
the floor pushes
upward on you
and gravity is
pulling down on
you, you are at
equilibrium.
16. Unbalanced Forces
• An unbalanced force always causes a change in
motion
• When unbalanced forces act in opposite
directions you can find the net force
– Net force
• Magnitude
– The difference between the two forces
• Direction
– Direction of the largest force
25. Normal
The forces are balanced/unbalanced
The man is moving/not moving
The forces are balanced/unbalanced
The woman is moving/not moving
Thrust
The forces are balanced/unbalanced The car is moving/not moving
26. Application Questions
1. A diver wears weights and dives into the
water, which force is bigger, his weight or
upthrust? Draw a diagram to show the
forces acting on him
2. The diver then releases the weight. Now,
which force is bigger, his weight or
upthrust? Draw a diagram to show the
forces acting on him.
27. Resultant Force
If two forces are unbalanced there is a
resultant force.
It could replace all the others to give the
same effect.
The difference between two forces is the
resultant force.
28. What is the resultant force?
100N 20N
Hint: work out the difference between
the two forces.
The resultant force is 100N – 20N = 80N
29. Resultant forces – question 1
5 N 5 N
1.A. What is the
resultant force on
the satellite?
B. To which
direction will the
satellite move? 20 N
30. Resultant forces – question 2
2.
a. What is the
horizontal resultant
force on the bird?
5N 5N
b. What is the
vertical resultant
force?
5N
c. To which direction
will the bird move?
31. Resultant forces – question 3
10N
13 N 10 N 20 N
10N
3.
a. What is the horizontal resultant force on the
yacht?
b. What is the vertical resultant force?
c. To which direction will the yacht move?
32. Resultant forces – question 1
1. What is the resultant force on the satellite?
5 N 5 N
Resultant force = 20 N – 10 N
= 10 N down
The satellite will accelerate
downwards.
20N
33. Resultant forces – question 2
2. What is the resultant force on the bird?
The forces acting in each
direction horizontally are equal
in size, so there is no resultant
force in this direction.
Resultant force = 5 N – 5 N = 0 N
5N 5N The vertical forces are not
balanced, the bird will accelerate
in a downwards direction.
5N Resultant force = 5 N – 0 N
= 5 N down
34. Resultant forces – question 3
3. What is the resultant force on the yacht?
10N
13 N 10 N 20 N
10N
The vertical forces are equal in size and opposite in direction
so there is no resultant force in the vertical direction.
The horizontal forces are not balanced, so the yacht will
accelerate to the right.
Resultant force = (20 N +10 N) – 13 N
= 17 N right
