Friction and Newton's First Law
An object that is not moving is said to be at rest. An object in motion will stay in motion forever unless it is acted on by an unbalanced force. So, when bumper cars are are used for example. An unbalanced force from another car acts on your car and changes your car's motion. The collision changes your car's motion, not your motion. Your motion continues with the same velocity. Another unbalanced force, from your seat belt, changes your motion.