Question

A student walking in school corridor with school bag on shoulders state whether work is not or not with reason

Answer 1

Answer:

work is not done

Explanation:

since work= force x displacement

w=fdccosQ

here since the boy is moving (for example) in right direction bag is also displacing in the same direction however the weight which is force on bag is applied downwards

this means the the angle between force and displacement is 90° (Q)

hence

w=fdsos90°. >cos90°=0

w = fd(0)

w=0

hence no work is done ✅

Answer 2

okay

if one walks in a plain surface without any inclination on it.

It will not gonna consider as work because

Gravitational force on the bag is acting in the downward direction. Since the boy walks horizontally on the corridor his vertical displacement is zero.

Hence,

Work done against gravitational force is zero.

and if the workdone is 0.then it's not a work.