A person is running on a track. Which of the following forces propels the runner forward?

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Pick the correct answer choice, and then give reasons why the other choices are false.

A. The normal force exerted by the ground on the person

B. The normal force exerted by the person on the ground

C. The force of friction exerted by the ground on the person

D. The force of friction exerted by the person on the ground

1 Answer

  • B. The force exerted by the person on the ground.

    The other “friction as a force” answers are incorrect since friction does not propel, it resists motion.

    And the only friction that exerts a force is a small amount of air resistance on a runner.

    So friction plays only a small roll In the runner scenario.

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