Newton's Third Law

What is Newton's Third Law of Motion?

• An object at rest stays at rest unless acted upon by an external force.

• For every action, there is an equal and opposite reaction.

• The acceleration of an object is directly proportional to the net force acting on it.

• Energy cannot be created or destroyed.

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Which of the following best describes action and reaction forces?

• They act on the same object.

• They are equal in magnitude and opposite in direction.

• They cancel each other out.

• They are always gravitational forces.

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Identify an example of action-reaction forces from the following scenarios.

• A book resting on a table.

• A rocket launching into space.

• A car accelerating on a highway.

• A person sitting on a chair.

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How does Newton's Third Law apply when you jump off a small boat onto a dock?

• The boat moves forward as you jump.

• The boat remains stationary.

• The boat moves backward as you jump.

• The boat sinks.

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Which of the following is an application of Newton's Third Law in everyday life?

• A car engine running.

• Walking on the ground.

• A light bulb glowing.

• A refrigerator cooling.

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Explain how action-reaction forces are involved when a swimmer pushes against the water to move forward.

• The swimmer's push is the action force, and the water's push back is the reaction force.

• The water's resistance is the action force, and the swimmer's push is the reaction force.

• The swimmer's movement is the action force, and the water's movement is the reaction force.

• The swimmer's push is the reaction force, and the water's push back is the action force.

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In a collision between two cars, how does Newton's Third Law explain the forces experienced by each car?

• Both cars experience different magnitudes of force.

• Both cars experience equal and opposite forces.

• Only the car with greater mass experiences force.

• Only the car with lesser mass experiences force.

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A person is standing on a skateboard and throws a heavy ball forward. What happens to the skateboard?

• It moves forward.

• It moves backward.

• It remains stationary.

• It moves sideways.

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How does Newton's Third Law relate to the conservation of momentum in a closed system?

• Momentum is not conserved due to external forces.

• Action and reaction forces ensure momentum is conserved.

• Momentum is only conserved in elastic collisions.

• Momentum is conserved only when objects are stationary.

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A balloon is released and flies across the room. Which statement best describes the action-reaction pair?

• The air inside the balloon pushes the balloon forward, and the balloon pushes the air backward.

• The balloon pushes the air forward, and the air pushes the balloon backward.

• The air inside the balloon pushes the balloon backward, and the balloon pushes the air forward.

• The balloon and air move in the same direction.

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