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Friction and Vertical Circular Motion Problems

A ball tied t...

Question

A ball tied to a string is swung in a vertical circle. Which of the following remains constant?

A

Tension in the string.

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B

Speed of the ball.

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C

Centripetal force.

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D

Earth's pull on the ball.

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Solution

The correct option is C Earth's pull on the ball.
Earth's pull on the ball remains constant $(W = m g)$ .
Tension in the string changes along the vertical circular path.
Speed of the ball changes as sum of kinetic energy and potential energy remains constant during motion.
Speed changes, hence, centripetal force changes.

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