Given below is a few situations, study them and state in which of the given cases work is said to be done. Give reason for your answer.
Given below is a few situations, study them and state in which of the given cases work is said to be done. Give reason for your answer.
(a) A person pushing hard a huge rock but the rock does not move.
(b) A bullock pulling a cart up to 1 km on road.
(c) A girl pulling a trolley for about 2m distance.
(d) A person standing with a heavy bag on his head.
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(a) Work done = 0,
Reason- As the rock has not moved so displacement is zero.
(b) Work done = Positive
Reason – As the motion is in the direction of force applied.
(c) Work done = Positive
Reason – As the trolley is moving in the same direction in which force is applied.
(d) Work done = 0
Reason – As there is no movement in the position of the bag, therefore displacement is zero.
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