Qstnid -I-8-a Heavy Box Is Kept On A Smooth Inclined Plane And Is Pushed Up By A Force F Acting Parallel To The Plane. Does The Work Done By The Force F As The Box Goes From A To B Depend On How Fast The Box Was Moving At A And B? Does The Work By The Force Of Gravity Depend On This? - 08: Work And Energy

with Solutions -

#8
A heavy box is kept on a smooth inclined plane and is pushed up by a force F acting parallel to the plane. Does the work done by the force F as the box goes from A to B depend on how fast the box was moving at A and B? Does the work by the force of gravity depend on this?
Ans : (i) No. As the surface is smooth and the friction is zero, work done by the force will only depend on the force and the displacement.
(ii) No, because gravitational force is a conservative force and work done by a conservative force will depend only on the force and the displacement.
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