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Old Jul 24th 2017, 02:25 PM   #11
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Originally Posted by avito009 View Post

F = dp/dt = d(m*v)/dt

m (mass) is a constant here, so it can be taken out (the product rule at work here!)

Therefore, F = m*(dv/dt) = ma (because acceleration a = dv/dt), which is basically Newton's Second Law defining force as the product of mass and acceleration.
Just a note:

Newton's Second Law (as Newton himself expressed it) = F = dp/dt = d(m*v)/dt

F = ma is Euler's formulation of Newton's second Law
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Old Jul 27th 2017, 01:56 PM   #12
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Newton's Laws

In stating Newton's Laws, is not one obliged to qualify them as being "approximate," as a disclaimer of sorts?

Just wondering! JP
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