1. Newton’s 3rd Law of Motion
Ch. 2, Section 4
Page 55 – 61

2. Newton’s 3rd Law of Motion
The 3rd Law of Motion states: if __ONE__ object exerts a force on another object, then the __2nd__ object exerts a force of __EQUAL__ strength in the __OPPOSITE__ direction on the 1st object.
For __EVERY__ action there is an __EQUAL__ but __OPPOSITE__ reaction.
Brain Pop- (3:03) Newton’s Laws of Motion

3. Action – Reaction Pairs
Is a Pair of objects that interact to produce a __FORCE__ on each other of __EQUAL__ force but in the __OPPOSITE__ direction.
Object A exerts a __FORCE__ on object B that __PUSHES/PULLS__ it; and object B exerts a __FORCE__ on object A that __PUSHES/PULLS__ it.

4. Detecting Motion
You __CANT__ always detect __ACTION – REACTION PAIRS__
You __JUMPING__ off the ground: __GRAVITY__ pulls you to the Earth, you don’t see your __BODY__ pull the __EARTH__ towards you.

5. Do Action – Reaction Pairs Cancel?
Action and Reaction Pairs __DO NOT__ cancel each other out because they are __ACTING__ on __DIFFERENT__ objects.

6. Momentum __MOMENTUM__ is called a __QUANITY__ of __MOTION__
Momentum is a characteristic of a __MOVING__ object that is related to the __MASS__ and the __VELOCITY__ of the object.
Momentum = __MASS__ X __VELOCITY__
The label for momentum is __Kg X M/S__
The __MORE__ momentum a moving object has, the __HARDER__ it is to stop.
The __MASS__ of an object affects the amount of __MOMENTUM__ the object has.
The __VELOCITY__ of an object also affects the __AMOUNT__ of momentum an object has.

7. Conservation of Momentum
Conservation refers to the conditions __BEFORE__ and __AFTER__ some event.
Momentum may be __TRANSFERRED__ from 1 object to another, but __NONE__ is lost.
The amount of momentum is the __SAME__ before and __AFTER__ they interact.
The total __MOMENTUM__ of any group of objects remains the __SAME__, or is conserved, unless outside forces act on the objects.
__FRICTION__ is an example of an outside force.
Newton’s Cradle (1:49)-

9. Collisions with 2 Moving Objects (P. 60)
2 equal __MASS__ objects traveling in the same direction, 1 object is traveling faster than the other, during a collision the speed of each car __CHANGES__.
The __MOMENTUM__ of 1 object __DECREASES__ while the momentum of the other __INCREASES__

10. Collisions with One Moving Object
2 __EQUAL__ mass objects, 1 object is moving and 1 object is not moving, during a collision the __MOVING__ object is __STOPPED__ and stopped object is __MOVING__
__ALL__ of the momentum has been __TRANSFERRED__ from the __MOVING__ object to the __NON-MOVING__ object.

11. Collisions with Connected Objects.
2 equal mass __OBJECTS__, 1 object is moving and 1 object is not moving, during a collision the objects __STICK__ together. There __MASS__ is __DOUBLED__ and the __VELOCITY__ is divided in __HALF__, the total momentum __REMAINS THE SAME__.
Newton’s 3rd Law of Motion – (5:58)