Of course this force was exceedingly small, compared with that of the earth; and for that reason the vibrations of this pendulum were by far slower than those of a common one.
当然，跟地球的引力比较，大球的引力极其微小；所以，小球的摆动比通常所见的摆动要缓慢得多。
2
The center of mass will immediately produce a force that swings the aircraft back to its position directly below the fulcrum, just as a pendulum or keel would.
大规模的中心会立即产生波动的力量，飞机回到自己的立场正下方的支点，就像一个钟摆或龙骨会。
3
Do the tangential force, the mormal force, the resultant force and their directions during oscillation of a simple pendulum change?