Question
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
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Answer
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Positive work: Work done by the force applied by a person on a ball that is thrown upwards.
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Negative work: Work done by gravitational force of earth on a ball thrown upwards.
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Zero work: Work done by gravitational force of earth on a box that is sliding horizontally on the ground.
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