A trampoline is a device consisting of a piece of taut, strong fabric stretched between a steel frame often using many coiled springs. People bounce on trampolines for recreational and competitive purposes.
A youth bouncing on a trampoline
Inuit blanket toss in Wainwright, Alaska (1922-1923) during Amundsen's Maud Expedition
Iñupiat blanket toss during the Nalukataq festival in Utqiagvik, Alaska (2006)
1968 demonstration of Spaceball
A spring is a device consisting of an elastic but largely rigid material bent or molded into a form that can return into shape after being compressed or extended. Springs can store energy when compressed. In everyday use, the term most often refers to coil springs, but there are many different spring designs. Modern springs are typically manufactured from spring steel. An example of a non-metallic spring is the bow, made traditionally of flexible yew wood, which when drawn stores energy to propel an arrow.
Helical coil springs designed for tension
A heavy-duty coil spring designed for compression and tension
A machined spring incorporates several features into one piece of bar stock
Military booby trap firing device from USSR (normally connected to a tripwire) showing spring-loaded firing pin
