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Standard X
Physics
Work
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Question
Give one example each in which force does (a) positive work (b) negative work (c) zero work
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Solution
(a) When a ball falls from a height gravitational force acts in the direction of displacement doing a positive work
(b) friction acts in opposite direction of displacement in vehicles doing a negative work
(c) Earth revolves around sun in elliptical orbit , sun's gravitational force does zero work on earth
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