24 jan .2017LEARNING physics
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. ... The third law states that for every action (force) in nature there is an equal and opposite reaction.
Newton's Laws of Motion - NASA
https://www.grc.nasa.gov/www/k-12/airplane/newton.html
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