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What is meant by positive work, negative work and zero work? Give one example of each. |
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Answer» Solution :Positive work: If a force ACTING on a body has a component in a direction of the DISPLACEMENT. Eg: When a body falls under free fall. `(theta=0^(@))` Negative work: If a force acting on a body has a component in the opposite direction of the displacement. Eg: When brakes are APPLIED to a moving vehicle, the work DONE by the brake force is negative. Zero work: If the body gets displaced ALONG a direction perpendicular to the direction of applied force. Eg: When a coolie walks on a horizontal platform with load. |
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