Newton's Third Law

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📚 Part 1: Understanding Action-Reaction Pairs

1. Newton's Third Law states that for every action, there is an equal and opposite reaction. Which statement best describes this law?

Forces always act in the same direction

Action and reaction forces occur on the same object

Action and reaction forces occur on different objects and are equal in size but opposite in direction

Heavier objects always exert stronger forces

2. When you walk forward, you push backward on the ground. What is the reaction force?

The ground pushes forward on your foot

You push forward on the ground

Gravity pulls you down

Air resistance slows you down

3. A rocket launches by shooting gas downward. What propels the rocket upward?

The weight of the fuel

The reaction force from the expelled gas pushing up on the rocket

Air pressure beneath the rocket

Gravity pulling the rocket up

4. Two skaters push off each other. Skater A (120 lbs) and Skater B (80 lbs) will move with:

The same speed in opposite directions

Different speeds but equal forces acting on them

Skater A moving faster than Skater B

No movement because the forces cancel out

🎯 Part 2: Identifying Force Pairs

5. For each scenario below, identify the action force and its reaction force pair:

a) A swimmer pushes water backward with their hands:

Action force: ________________________________

Reaction force: ______________________________

b) A book rests on a table:

Action force: ________________________________

Reaction force: ______________________________

c) A hammer hits a nail:

Action force: ________________________________

Reaction force: ______________________________

6. Draw a diagram showing the action-reaction force pairs for a person jumping off a diving board. Use arrows to show the direction of forces and label each force clearly.

7. Explain why you can't lift yourself up by pulling on your shoelaces, using Newton's Third Law in your answer.

🚀 Part 3: Real-World Applications

8. A balloon rocket moves forward when air rushes out the back. Complete the following:

The action force is: _________________________________

The reaction force is: _______________________________

This demonstrates Newton's Third Law because: ___________

_________________________________________________

9. Why do guns have a "kick" or recoil when fired? Explain using Newton's Third Law.

10. Design Challenge: Describe how you would use Newton's Third Law to create a simple vehicle that moves without wheels. What would be your action force and reaction force?