A block of mass is pulled slowly up a smooth inclined plane of height and inclination…
PHYSICS · Single correct · CBSE · Physics · Work and Energy · Work and Energy
Problem
A block of mass m is pulled slowly up a smooth inclined plane of height h and inclination θ by a string parallel to the incline. Which statement is incorrect when the block moves from the bottom to the top of the incline?
(1) Work done by the normal reaction force is zero
(2) Work done by the string is mgh
(3) Work done by gravity is mgh
(4) Net work done on the block is zero