Is Newton's Third Law Always Accurate in Non-Inertial Frames?

averycasille · 2016-04-23T12:29:28+00:00

1) " The total momentum of a system of interacting bodies remains constant, providing no external force acts. " Why is this untrue?

Thread 'Derivation of Hamilton's Principle: Questions'

I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...

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Thread 'Derivation of Hamilton's Principle: Questions'

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