What are the situations in which work is not done?
There are 3 conditions for work. First, there must be force. Second, when you apply a certain amount force to an object, it must move a certain distance. lastly, the force that you applied and the direction of the motion must be parallel. If you applied force tot eh right, then the object must move to the right.
When you lift a book and then you walk around, no work is done. The direction of the force of your hand is going upwards while the direction of your motion is either left or right. Therefore the force applied and the distance moved are perpendicular.
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