PHYSICS · Subjective · AP · Physics 1: Algebra-based · Work Energy and Power · Work Energy and Power
Problem
A block of mass 5.0kg rests on a horizontal floor. It is pulled from rest by a constant horizontal force of 20N through a distance of 4.0m. The coefficient of kinetic friction between the block and the floor is 0.20.
(i) Calculate the work done by the pulling force.
(ii) Determine the work done by the frictional force.
(iii) Find the net work done on the block and hence obtain the speed of the block after moving 4.0m.
(iv) Compute the kinetic energy of the block at this instant and the average power supplied by the pulling force during the motion.