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Work Done by Force of Gravity

Calculate the...

Question

Calculate the amount of work done by:
(a) A weight-lifter is holding a weight of 120 kg on his shoulder for 30 s.
(b) A locomotive against gravity, if it is travelling on a plain road.

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Solution

a) As there is no displacement in the body there will not be any work done.
b) While travelling on a plane road locomotive does not have any displacement in the direction of force of gravity so their will not be any work done.

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Similar questions

Q. What is the amount of work done by:
(a) A weight - lifter in holding a weight of

120 k g

on his shoulder for

30 s

.
(b) A locomotive against gravity, if it is travelling on a plane road.

Q. How much work is done by a weight lifter when he holds a weight of 80 kg on his shoulders for two minutes ?and why?

Q. A boy holds a

40 N

weight at arms length for

10 s

1.5 m

above the ground. The work done by the force of the boy on the weight while he is holding it is:

A weight lifter lifted a load of

200 k g

2.5 m

5 s

. calculate the work done by weight lifter on load. Take

g = 10 m / s^{- 2}

Q. Assertion :A weight lifter does no work in holding the weight up. Reason: Work done is zero because distance moved is zero.

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