大多数时候，板块之间的摩擦力使两者紧紧挤在一起，并随着时间增加，挤压力逐渐增加。
Most of the time, friction between the plates causes them to stick together, and stress increases over time.
大量运动部件、滑动摩擦、极短时间内运动方向的变化以及机械冲击等都使摩损加剧。
The great number of moving parts, the sliding friction, the reversal of direction at rapid intervals, and the mechanical shock involved all contribute to severe wear.
图表显示与时间相对的摩擦力、位置、速率和加速度。
Charts show the forces, position, velocity, and acceleration vs. time.
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