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在力学中经常遇到这样一类问题:空气流对墙的压力、一注水流打在煤层上对煤层的冲力、高射机枪的反冲力、火箭的推力以及理想气体的压强等等。我们可把这类问题归结为流动体的冲力。所谓流动体,这里指的是一束有速度的气体或液体或固体的颗粒流,以区别于"流
Often encountered in mechanics such a type of problem: the air flow against the wall pressure, a water injection hit the seam on the coal seam, anti-aircraft machine gun recoil, rocket thrust and ideal gas pressure and so on. We can attribute this type of problem to the momentum of a mobile body. The so-called fluid, here refers to a bunch of gas with a velocity or a stream of liquid or solid particles to distinguish it from the flow