Answer to Question #90211 in Mechanics | Relativity for Murari

Question

What is the difference between standing still on trampolin and jumping on trampolin how does spring react in both cases pls explain in easy way Because standing still doesnt provide bounce

Answer 1

Explanation in terms of effort: When an athlete is standing on a trampoline, the weight of the athlete is balanced by the elastic force of the trampoline. Because the athlete does not move, he maintains a state of rest and beyond. When an athlete jumps on a trampoline, he creates an additional stretch of a trampoline, the strength of which is already greater than the weight of the athlete. An athlete can increase stretching by putting pressure on the trampoline with his feet at the right time, thereby increasing the height of the jump.

In terms of energy: When an athlete is standing, the system is in balance. Her total energy is 0 in this position. To bring the system out of balance requires additional energy. It is taken from the fact that the athlete jumps - kinetic energy. Kinetic energy is generated from the work of gravity (displacement of the center of mass of the athlete) and the work of the leg muscles, which, straightening, stretch the trampoline more strongly. This additional energy is transferred to the energy of the stretched trampoline, and then to the potential energy of gravity. The athlete rises higher and higher, because he adds to the system, with each jump, more and more energy, which is well preserved due to the elastic properties of the trampoline and returns to the athlete.