1. Newton’s 3rd Law of motion
Chapter 6

2. What do you think will happen once the ball actually hits the racket?

3. Newton’s 3rd Law of Motion
Whenever one object exerts a force on a second object, the second object exerts an equal & opposite force on the first.

4. Newton’s 3rd Law of Motion
All Forces act in pairs.
only deals with Forces, not motion … but how force-pairs interact affects the motion of objects.

5. Force-Pairs
do not act on the same object.
A Force is always exerted by one object on another object.
If they acted on the same object, the net force would always be 0 N and nothing would ever move!

6. When a force is exerted (action), there is always a reaction force.
Action & reaction
When a force is exerted (action), there is always a reaction force.
A force never acts by itself.
Video:

7. Reaction can be Difficult to See
If you drop a ball, gravity pulls the ball toward Earth.
This force is the action force exerted by Earth on the ball.
But gravity also pulls Earth toward the ball.
This force is the reaction force exerted by the ball on Earth.

8. Newton’s Third Law of Motion
Video Demonstration
Video Recap