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Which of the following must occur in order for work to be done?

AThe object must use a machine.
BThe object must move.
CThe object must make another object move.
DThe object must not move.

Verified Answer :

When a force is applied to an object makes the object to move, work is done by the force. 

force is exerted  and the object moves a distance d in a direction other than the direction of the force, less work is done than if the object moves a distance d in the direction of the applied force.

w=fdcos theta
B. The object must move. 

Answer: Option (B) is the correct answer.

Explanation:

When we apply force on an object then the movement or displacement of the object from its initial position is known as work.

For example, when we move a sofa from lobby to a room then it means work is done on sofa.

Therefore, in order for a work to be done it is necessary that the object must move from its initial position or place.

Thus, we can conclude that the object must move should occur in order for work to be done.

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