A block is pulled up a smooth incline long that makes an angle of with the horizontal
PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
A 4kg block is pulled up a smooth incline 6m long that makes an angle of 25∘ with the horizontal. The pulling force has a constant magnitude F and is applied by a light rope that makes an angle of 15∘ above the surface of the incline.
(a) Calculate the work done by the weight of the block during the 6m upward displacement along the incline.
(b) The block moves with constant speed up the plane. Using this information, determine the magnitude of the pulling force F.
(c) Find the work done by the pulling force during the ascent.
(d) Show, by considering the work done by all forces and the changes in potential and kinetic energies, that the total mechanical energy of the block remains unchanged over the motion.