Besonderhede van voorbeeld: 1959118883415080872

English

If force is changing, or if the body is moving along a curved path, possibly rotating and not necessarily rigid, then only the path of the application point of the force is relevant for the work done, and only the component of the force parallel to the application point velocity is doing work (positive work when in the same direction, and negative when in the opposite direction of the velocity).

Chinese

如果力會變化,或身體延曲線方向移動,物體可能轉動甚至並非剛性物體,那麼其所作的功只和作用力的角度、路徑有關,並且只有部分的力平行在作用點上形成的速度才作功 (相同方向為正,反方向為負值),此處的力可以被描述為純量或是切線分量的純量。