**Unformatted text preview: **acceleration, the second relating impulse and momentum. Relating Force and Acceleration The first equation, involving calculus, reverts back to Newton's Laws. If we take a time derivative of our momentum expression we get the following equation: = ( mv ) = m = ma = F Thus = F It is this equation, not F = ma that Newton originally used to relate force and acceleration. Though in classical mechanics the two equations are equivalent, one finds in relativity that only the equation involving momentum is valid, as mass becomes a variable quantity. Though this equation is not essential for classical mechanics, it becomes quite useful in higher-level physics....

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