So let's first go to the rod, then, and make a comparison between the rod and the pendulum.
第一个用杆子，我们在杆子，和摆之间做个比较。
So if you look at the rod-- and we use the pendulum as our standard, l-- with length little l-- then you see the period will be the same if 1 1/2 R is little l...
所以如果你看杆子-,我们用摆作为标准，长度为-,你会发现如果,1，1/2，R等于l，周期相同。
When we make the rod shorter, the pendulum vibrates faster.
杆越长，摆摆动的速度越慢。
When we make the rod shorter, the pendulum vibrates faster.
庞大的桥面躯体和吊杆来回地摆动。
Gravitational capture, rod-pendulum, lever, motorcycle lift-off.
重力俘获。球摆，杠杆，离地时的摩托车。
Gravitational capture, rod-pendulum, lever, motorcycle lift-off.
重力俘获。球摆，杠杆，离地时的摩托车。
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