秋千的摆荡研究

A Study on the Swinging Movement of a swing

本文用参变振动理论和能量转换关系，探讨秋千的摆荡运动。研究表明，秋千来回摆荡一次，人体下蹲和站起动作要做二次，摆通过两端点时身体要充分蹲下，通过中间位置时要猛力站直。

In this paper,the swinging movement of a swing has been discussed according to the theory ofpara metric vibration and energy conversion. It shows that a man must stand up and squat down twicefor each swinging back and forth.He should squat down fully whlle the swing goes up to its twomghest points,and vigorously stand up while the swing goes down to its lowest place;