If you pull horizontally on a crate with a force of 200 N, it slides across the floor in dynamic equilibrium. How much friction is acting on the crate?
Solution: Consider a crate being pushed horizontally across a factory floor in 200 N. If it moves at a steady speed in a straight line path, it is in dynamic equilibrium. The above line tells us that more than one force act on the crate. Another force exists likely the force of friction between the crate and the floor. The fact that the net force on the crate equals zero means that the force of friction must equal an opposite to the pushing force of 200 N.