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).
悬挂在枢轴上的重物，使其可以自由摆动。当摆从其静止平衡位置向侧面移动时，它会受到重力产生的恢复力，从而加速其回到平衡位置。