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有关机械效率的计算题,关键是注意以下几点.首先,要明确有用功和总功的含义及其计算方法.有用功就是机械克服有用阻力所做的功,有用功的大小等于有用阻力跟物体在有用阻力的反方向上移动距离的乘积.当利用机械
The key to calculating the mechanical efficiency is to pay attention to the following points. First, it is necessary to clarify the meaning of useful work and total work and the calculation method. The useful work is the work done by the machine to overcome the useful resistance. The size of useful work is equal to the useful resistance. The product of the distance the object moves in the opposite direction of the effective resistance. When using machinery