1. Section 2.3 Forces act in pairs

2. Newton’s Third Law
When one object exerts a force on another object, the second object exerts an equal and opposite force on the first object.

3. Action/Reaction Pair
The force that is exerted on an object and the force the object exerts back.

4. Action and Reaction forces Versus balanced forces
act on one object
Action and Reaction forces
Act on 2 different objects

5. Give examples of both
Balanced Forces
Action/Reaction

6. Newton’s three laws can explain and predict motion.

7. 2.3 Review questions ON PAGE 38 in your ISN
Demonstrate your understanding of Newton’s third law and section 2.3
WRITE YOUR SUMMARY!!!

8. 2.3 Review Questions
The force of the ball on your hand, the force of your hand on the ball.
Balanced forces act on one object, and each cancels the effect of the other. Action and reaction forces act on two different objects.
Force exerted by cat overcome’s cat’s inertia
Force cat needs to accelerate depends on its mass.
When running, cat applies backwards force on ground and ground applies forward force on cat

9. 2.3 Review Questions
4. 50 N in direction opposite to his force on the wall 5. It is incorrect, the reaction force doesn’t act on the box, it acts on Jim 6. Before: no change in velocity = 0 m/s2 After: a = F/m = 10 N/50 kg = 0.2 m/s2