The elastic force of a trampoline is generated by the deformation of the trampoline when it is subjected to pressure. When people jump on a trampoline, the trampoline will be depressed by pressure, and this deformation gives the trampoline elastic potential energy. Subsequently, the trampoline will generate an upward elastic force by recovering its deformation, which will bounce people up. This process is the result of the continuous conversion of gravitational potential energy, kinetic energy, and elastic potential energy.
In addition, trampolines are usually made of springs or other elastic materials that generate elastic force when compressed. For example, a sponge pad generates an upward elastic force when it is deformed by pressure, while a springboard generates an elastic force by bending under pressure to bounce people up. These examples illustrate how elastic force is generated in trampolines and other related sports equipment.