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CHAPTER 3: FORCES 3.3 THE THIRD LAW OF MOTION.

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Presentation on theme: "CHAPTER 3: FORCES 3.3 THE THIRD LAW OF MOTION."— Presentation transcript:

1 CHAPTER 3: FORCES 3.3 THE THIRD LAW OF MOTION

2 Newton’s Third Law of Motion
describes action-reaction pairs When one object exerts a force on a second object, the second one exerts a force on the first that is equal in strength and opposite in direction. flickr.com

3 Action and reaction forces act on DIFFERENT objects!
Even though these forces are equal, they are NOT balanced because they act on different objects.

4 Describe the action – reaction forces of a swimmer.
offthelip.org

5 Momentum The product of an object’s mass and velocity.
The symbol for momentum is p. The units of measurement are kg x m/s

6 Net force on an object can be calculated by dividing its change in momentum by the time over which the change occurs.

7 Law of Conservation of Momentum
The momentum of an object cannot be changed, but can be transferred to another object. flickr.com

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