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Newton's Third Law of Motion

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4.7Newton's Third Law of Motion

Newton's Third Law of Motion Revision Questions

1. Which of the following pairs of forces represents an example of the Newton's Third Law of Motion?

  1. Gravitational force of the Earth acting on an object at rest and the weight of the object
  2. Pulling force of a girl at a rope and the tension force of the rope
  3. Moving force of a car and frictional force between its tires and the ground when the car is moving at constant velocity
  4. Pulling force of a hanged object to a spring and the pulling force of the spring to the object

Correct Answer: D

2. Which of the forces shown in the figure represents the reaction of the force FA?

Physics Tutorials: This image provides visual information for the physics tutorial Newton's Third Law of Motion
  1. FB
  2. FC
  3. FD
  4. FE

Correct Answer: B

3. Which of the following is not the same for two forces involved at an action-reaction process?

  1. Magnitude only
  2. Direction only
  3. Direction and application point
  4. Magnitude and application point

Correct Answer: C

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  5. Continuing learning dynamics - read our next physics tutorial: What Causes Motion? The Meaning of Force

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