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Q.

Each of the following statements describes a force acting on the bodies. In which of the following statements, is work being done?


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a

the weight of a book at rest on a table

b

the pull of a moving railway engine on its coaches

c

the tension in an elastic band wrapped around a parcel

d

the push of a person's feet when standing on the floor 

answer is B.

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Detailed Solution

The pull of a moving railway engine causes work to be done on its coaches.
Work done in moving a body (W) is equal to the product of force exerted on the body (F) and the displacement of the body in the direction of force (s).
Work is said to be done when an external force moves a body by a certain distance along its direction. When we pull a moving railway engine on its coaches, we observe the motion of the body in the direction of the force applied, which causes work to be done on its coaches.
    
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Each of the following statements describes a force acting on the bodies. In which of the following statements, is work being done?