Isaac Newton on Motion

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I can calculate the motion of heavenly bodies, but not the madness of people.
Isaac Newton
Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
Isaac Newton
The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
Isaac Newton