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rcgldr
#3
Nov18-12, 06:23 PM
HW Helper
P: 7,135
A trampoline provides a near ellastic collision between the person and the bed (surface) of the trampoline, and also extends the time of the collision, reducing the peak amount of force related to the deceleration and acceleration of each bounce. A person can use his/her muscles to increase the force, and the increase in KE will be equal to the net increase in force over the distance of the bounce. Typically most of the effort is performed near the bottom of the bounce, where the total force is greatest. Note the forces in a competitive situation are large enough that a person can't bend the legs very much without the legs buckling, but only a small amount of relative leg motion is required to maintain or increase KE on a high bounce with high forces involved. Actually it's possible to generate enough force by swinging arms around in a circle at the right moments with the legs kept stiff on a quality trampoline to increase the KE for a fairly high bounce.