Third Law

A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

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

• Every mass exerts a force on every other mass.

• An object at rest tends to stay at rest.

• Friction opposes the motion of an object.

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Newton’s law states that for every action, there is an ________ reaction.

• unequal and opposite

• equal and similar

• stronger and opposite

• equal and opposite

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When a small car pushes a big truck, the truck applies an equal and opposite force on the car.

• False

• True

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When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

• The cannon moving forward

• The cannon moving backwards

• The cannonball moving backwards

• The cannonball moving forward

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• 1st
• 2nd
• 3rd

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Which of the following best illustrates Newton's Third Law of Motion?

• A car accelerates down the road.

• A leaf falls gently to the ground.

• A swimmer pushes against the pool wall to propel forward.

• A book rests on a table without moving.

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Read the example given in the picture. Drag and drop correct answer to each box. Not all answers will be used.

These ​ (a)   are an example of the law ​ (b)   .

• forces

• action-reaction

• unbalanced forces

• gravity

• force and acceleration

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Newton's Third Law of Motion can be summarized as:

• Objects in motion tend to stay in motion.

• Force equals mass times acceleration.

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

• The acceleration of an object depends on the mass of the object and the amount of force applied.

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What is an example of Newton's Third Law of Motion?

• A car speeding up on a highway.

• A person sitting in a chair without moving.

• A rocket launching into space.

• A ball rolling down a hill.

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​ (a)   A climber pulls down on a rope causing his body to lift upward and rise along the rope.

• 3rd Law

• 1st Law

• 2nd Law

• Inertia

• Acceleration

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