Newton’s Third Law NOTES
1. Newton’s 3rd Law:
2. Another way to say it:
3. Example:
4. Can you always detect motion when paired forces are in action?
5. Can action and reaction forces cancel each other out?
6. Why or Why not?
7. Give an example:
Why not?
Momentum NOTES
1. The product of an object’s mass and velocity is
.
2. The formula you use to determine the momentum of an object is…
3. What is the unit of measurement for momentum?
WITH A DIRECTION!!
4. If a small object is traveling at a high speed it can have as
that a real massive object at a
speed.
5. The law of conservation of momentum states in the
objects that interact
momentum
of outside forces, the total momentum of
change.
6. The total momentum of any group of objects
, or is conserved, unless
outside forces acts on the objects.
7. Momentum can be
is an example of an outside force.
from one object to another. Example: a cue ball in pool pushes
the other balls on the table. This is the LAW OF CONSERVATION OF MOMENTUM. The
same.
Illustrate and explain each of the following collisions:
8. Collisions with two moving objects:
9. Collisions with one moving and one still object:
10. Collisions with connected objects:
remains the
Newton’s Third Law NOTES Key
1. Newton’s 3rd Law:
If one object exerts a force on another object, then the second object exerts a force of equal strength in the
opposite direction on the first object.
2. Another way to say it: For every action, there is an equal and opposite reaction
3. Example: Jumping: you exert of force (with your feet) onto the ground, the ground exerts and equal and
opposite force on your feed pushing you upwards
4. Can you always detect motion when paired forces are in action? No Why not? You don’t always see the
motion forces exert on each other because sometime they are very very small. For example
5. Can action and reaction forces cancel each other out? It depends on what the action/reaction forces are
exerting force on.
6. Why or Why not? If they are acting on different objects it will not cancel each other out. If they are acting on
the same object, they could cancel each other out.
7. Give an example:
NOT canceling each other out:
When they cancel each other out:
Momentum NOTES Key
8. The product of an object’s mass and velocity is momentum.
9. The formula you use to determine the momentum of an object is…
Momentum = Mass × Velocity
10. What is the unit of measurement for momentum?
Kg × m/s
WITH A DIRECTION!!
11. If a small object is traveling at a high speed it can have as much as momentum that a real massive object at a
lower speed.
12. The law of conservation of momentum states in the absence of outside forces, the total momentum of
objects that interact does not change change.
13. The total momentum of any group of objects remains the same , or is conserved, unless outside forces acts
on the objects. Friction is an example of an outside force.
14. Momentum can be transferred from one object to another. Example: a cue ball in pool pushes the other
balls on the table. This is the LAW OF CONSERVATION OF MOMENTUM. The momentum remains the same.
Using your text book on page 61M, explain each of the following collisions.
15. Collisions with two moving objects:
Momentum will be conserved
For example if a blue car moving at 4m/s and a green car moving at 2m/s, are going down the tracks
the same direction the blue train will catch up to the green train. When it does, the speed of both cars
will change: The blue car will slow down to 2m/s and the green car will speed up to 4m/s.
16. Collisions with one moving and one still object:
Momentum will be conserved in the form of transferring
For example: If a blue car is traveling at 4m/s and a green car is not moving. When the blue car hits the
green car it will transfer its momentum to the green car. The blue car will have a speed of 0m/s and the
green car will have a speed of 4m/s
17. Collisions with connected objects:
If two objects collide and become connected the momentum will remain the same. : If a blue car is
traveling at 4m/s and a green car is not moving. When the blue car hits the green car it gets stuck.
The mass of the moving objects double and the velocity is cut in half. If you calculate that- the
momentum is the same!!