You have learned that the speed of an object will not change when the net force acting on the object is 0. But you know that objects slow down when you stop pushing on them. Based on this simulation, why is it that objects always seem to slow down?
One reason why objects always seem to slow down is due to friction. Even when there is no net force acting on an object, the object is still subject to various types of friction such as air resistance, rolling resistance or sliding friction, which slows it down. In the absence of a force to maintain the object's speed, these frictional forces will eventually cause it to come to a stop. Additionally, with some objects, such as those with wheels, the movement may be slowed down by other external factors such as bumps, hills or obstacles that decrease their momentum.
