Question

List the situation where no work is done​

Answer 1

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1. When a table in on a floor at the same place for days together, there is no work done on the table by the gravitational force or normal reaction force.

2. If I hold a book for some time, there is no work done on it by me.

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Answer 2

Question :-

List the situations when no work is done or work done is 0

Answer :-

The situations are :-

• If the displacement is normal to the direction of force i.e theta = 0 , then cos 90° = 0 . Therefore , W = 0 .

Explanation :-

When a collie walks on a horizontal ground while carrying a load on his head , no work is done against the force of gravity because the displacement of load is normal to the direction of gravity which is vertically downwards .

➡️ [NOTE] :- The coolie does work against the force of friction when he moves the load .

• When there is no displacement ( i.e S=0 ) .

Explanation :-

When a body moves in a circular path in a horizontal plane no work is done since the centripetal force on the body at any instant is directed towards the centre of circular path and the displacement at that instant is along the tangent to the circular path i.e normal to the direction of force on the body ( i.e theta = 90 ° ) . it is for this reason that in a circular path the kinetic energy and hence the speed of the body does not change although a force acts on the body .

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