distinguish between posotive and negative work . when you lift an object , two forces act on it. identify these forces. which one of these two does (a) positive work , (b) negative work . justify your answer.
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Answer:
positive work of energy plays a role while we are going upstairs
negative work of energy plays a role while we are coming down
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the direction for displacement and force determines if it is positive or negative
Explanation:
when you lift an object you are applying force in upward direction however there is also a force of gravity acting downwards
your force does a positive work because it is in the direction of displacement
however the force acting on body due to gravity does a negative work because displacement and force are in opposite direction
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