when is the work done by a force on a body positive negative and zero

Work is done positive when the force is applied on the body and it move in the direction of the force while neative force is said to be done when force and displacement is not in the same direction.

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a force is said to be positive when suppose the applied force is on the west then the object moves towards west

a force is said to be negative when the oject is moving in opposite directions of applied force suppose the force is applied on west then even the object moves towards east eg if a man tries to push a moving train from front

zero can also be called as balanced force because the force applied from both the direction is balanced to each other

 

like please

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