A motor is pulling a box at a certain rate. You have velocity, a frictional coefficient, and the mass of the box. Find the power needed to keep the box moving at the original velocity and then convert to horsepower..

Question

anonymous · Answer

This is the same as the previous question you posted. 
Force of friction is calculated from
$$F_f = m \cdot g \cdot \mu$$
The motor applies a force equal to the force of friction because the box isn't accelerating. $$P = F_f \cdot v$$