Isaac Newton Quotes on Force
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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.
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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.
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To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.