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Physical laws in classical mechanics. Galilean invariance or the principle of Newtonian relativity. Galileo Galilei , however, realised that a force is necessary to change the velocity of a body, i. Law II: The alteration of motion is ever proportional to the motive force impress'd; and is made in the direction of the right line in which that force is impress'd. Any reference frame that is in uniform motion with respect to an inertial frame is also an inertial frame, i. Leonardo da Vinci understood that "An object offers as much resistance to the air as the air does to the object". When the mass varies due to accretion or ablation, [an alternate equation explicitly accounting for the changing mass] should be used.

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