pendulum
A weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position.
The following tags implicate this tag: holding_pendulum (learn more).
从枢轴悬挂的重量可以自由摆动。当摆钟从其静止，平衡位置向侧面移动时，由于重力，它会受到恢复力，从而将其朝向平衡位置加速。