Mechanics Kinematics: trajectories, velocity, acceleration, motion of rigid bodies, change of reference frame.

力学运动：轨迹、速度、加速度、运动、刚体动力学变化的参考帧。

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Some new concepts such as relative force, relative acceleration, relative reference frame, absolute force, absolute acceleration, and absolute reference frame was put forward.

提出了相对力、相对加速度、相对参照系和绝对力、绝对加速度、绝对参照系的新概念。

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Some new concepts such as relative force, relative acceleration, relative reference frame, absolute force, absolute acceleration, and absolute reference frame was put forward.

提出了相对力、相对加速度、相对参照系和绝对力、绝对加速度、绝对参照系的新概念。

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