Newton's laws of motion. These laws were first published in Isaac Newton's publication Philosophiae Naturalis Principia Mathematica in 1687. The first law states that if the net force (F) is zero, then the velocity (v) of the object is constant (t is time, d is the derivative). The second law states that the net force is equal to the mass of the body (m) multiplied by the body's acceleration (a). The third law states that to every action there is always opposed an equal reaction. If one object (A) exerts a force on a second object (B), then the second will apply an equal and opposite force.
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