物体对支持物的压力小于物体所受重力的现象叫失重。也就是视重小于实际重力，当近地物体的加速度向下时，其实际视重小于实际重力我们就称其处于失重状态 当物体以加速度g向下加速运动时（自由落体）我们叫它完全失重状态。
下面我将讨论,完全失重状态,记得几节课之前,我将你系在,绳子的末端。
I now want to return to the idea of complete weightlessness and I want to remind you, a few lectures ago how I was swinging you at the end of a string in the vertical.
绳子没有张力，完全松弛,不管吊着的是你还是水桶，均为失重状态。
So the string has no tension, the string goes limp and the bucket of water and you are weightless.
应用推荐