Which of the following is an example of negative work being done?

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Work done by gravity on a rolling ball

Hitting a stationary ball

Work done by friction on a sliding box

None of these

answer is C.

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Detailed Solution

Work done by friction on a sliding box is an example of negative work.
Work done:
“The work done by a force acting on an object is equal to the magnitude of the force multiplied by the distance moved in the direction of the force.”
Positive work done:
“The work done is said to be positive when force and displacement are in the same direction.”
Negative work done:
“The work done is said to be negative when force and displacement are in the opposite direction.”
Work done by friction on a sliding box is an example of negative work, as the force of friction on a sliding box acts against the direction of motion of the box.

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