A block of mass 5 kg is pulled up a rough incline that makes an angle of 30° with the…
PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
A block of mass 5 kg is pulled up a rough incline that makes an angle of 30° with the horizontal. The pulling force of 60 N is applied parallel to the incline. The coefficient of kinetic friction between the block and the surface is 0.15. The block starts from rest and is moved 8 m up the incline.
(i) Calculate the work done by the person pulling the block.
(ii) Calculate the work done by the component of gravitational force along the incline.
(iii) Calculate the work done by the force of kinetic friction.
(iv) Determine the net work done on the block.
(v) Hence find the speed of the block when it has moved 8 m up the incline.