Action-Reaction Pairs Quiz with Answers for Grade 8 Students

📚 Quick Study Guide

• 🍎 Newton's Third Law: For every action, there is an equal and opposite reaction.
• ➡️ Action Force: The force exerted by one object on another.
• ⬅️ Reaction Force: The force exerted by the second object back on the first.
• ⚖️ Equal in Magnitude: The action and reaction forces are equal in size.
• Opposite in Direction: The action and reaction forces act in opposite directions.
• 🎯 Simultaneous: Action and reaction forces occur at the same time.
• 💡 Example: When you jump, you push down on the Earth (action), and the Earth pushes up on you (reaction).

🧪 Practice Quiz

1. Which of the following best describes Newton's Third Law of Motion?
   1. A. An object in motion stays in motion unless acted upon by a force.
   2. B. Force equals mass times acceleration ($F = ma$).
   3. C. For every action, there is an equal and opposite reaction.
   4. D. Energy cannot be created or destroyed, only transformed.
2. When you walk, what is the action-reaction pair?
   1. A. Your foot pushing backward on the Earth (action) and the Earth pushing forward on your foot (reaction).
   2. B. Your body moving forward (action) and air resistance pushing back (reaction).
   3. C. Your leg muscles contracting (action) and your bones supporting you (reaction).
   4. D. Your brain telling you to walk (action) and your feet obeying (reaction).
3. A rocket launches into space. What is the action force in this scenario?
   1. A. The rocket pushing against the launchpad.
   2. B. The rocket's engine expelling gas downward.
   3. C. The Earth's gravity pulling the rocket down.
   4. D. The air pushing against the rocket.
4. What is the reaction force when a book rests on a table?
   1. A. The book pushing down on the table.
   2. B. The table pushing up on the book.
   3. C. Gravity pulling down on the book.
   4. D. The floor supporting the table.
5. A swimmer pushes water backward. What is the reaction force?
   1. A. The water moving backward.
   2. B. The swimmer moving forward.
   3. C. The water pushing the swimmer forward.
   4. D. The swimmer pushing the water.
6. If a baseball bat hits a baseball, which statement is true about the forces?
   1. A. The bat exerts a force on the ball, but the ball exerts no force on the bat.
   2. B. The bat exerts a greater force on the ball than the ball exerts on the bat.
   3. C. The ball exerts a greater force on the bat than the bat exerts on the ball.
   4. D. The bat and ball exert equal and opposite forces on each other.
7. When a car accelerates forward, what force propels it?
   1. A. The engine's force directly pushing the car forward.
   2. B. The tires pushing backward on the road.
   3. C. The road pushing forward on the tires.
   4. D. The air pushing against the car.