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gang ti li xue zhong mo ca li de gong
Author(s): 
Pages: 45-46
Year: Issue:  3
Journal: Journal of Lingling Teachers College

Abstract: 在研究刚体的运动时,一般不能把刚体视为质点.除非刚体在作纯平动,这时在任何给定的时间间隔内,组成刚体的所有质点都经历着同样的位移,因而可把刚体作为质点处理.当刚体可被视为质点时,刚体间任一摩擦力的功为:W=∫(?),式中(?)是力(?)所作用的刚体的位移.当刚体有转动时,组成刚体的各质点的位移不全相同,这时上式中的d(?)就应理解为力(?)所作用的刚体上一确定的质点的位移.因此,我觉得87年第3期《力学与实践》所载的“关于力的功的定义”一文的基本观点值得商榷.
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