Tuesday, 14 July 2015

newtonian mechanics - Why is force described as rate of change of momentum?




momentum = mass * velocity



Differentiating both sides leads to




force = mass * acceleration



since the mass doesn't participate in the differentiation as it is constant.




Is this a sound definition, or a pointless use of differentiation? Or are there systems (like rockets) where the mass is also a variable wrt time?




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