Newton used them to investigate and explain the motion of many physical objects and systems, which laid the foundation for classical mechanics. The three laws of motion were first stated by Isaac Newton in his PhilosophiƦ Naturalis Principia Mathematica ( Mathematical Principles of Natural Philosophy), originally published in 1687. If two bodies exert forces on each other, these forces have the same magnitude but opposite directions.When a body is acted upon by a net force, the body's acceleration multiplied by its mass is equal to the net force.A body remains at rest, or in motion at a constant speed in a straight line, unless acted upon by a force.These laws can be paraphrased as follows: Newton's laws of motion are three basic laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it.
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