Wooden roller coasters provide a very different ride and experience from steel roller coasters. While they are traditionally less capable than a steel coaster when it comes to inversions and elements, wooden coasters instead rely on an often rougher and more "wild" ride, as well as a more psychological approach to inducing fear. Their structures and track, which usually move anywhere from a few inches to a few feet with a passing train, give a sense of unreliability and the "threat" of collapse or disregard for safety. Of course, this assumption is purely mental, and wooden roller coaster supports and track systems are designed to sway with the force. If the track and structure are too rigid, they will break under the strain of the passing train. The swaying of the track reduces the force applied per second (see impulse), like a shock absorber.