In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction. In the second law, the force on an object is equal to its mass times its acceleration. In the first law, an object will not change its motion unless a force acts on it. … In it, he determined that massive objects cause a distortion in space-time, which is felt as gravity. Gravity Probe B showed this to be correct. Gravity is most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915), which describes gravity not as a force, but as a consequence of the curvature of spacetime caused by the uneven distribution of mass.Įinstein’s theory of general relativity predicted that the space-time around Earth would be not only warped but also twisted by the planet’s rotation. And if you were on a planet with less mass than Earth, you would weigh less than you do here. All its mass makes a combined gravitational pull on all the mass in your body. Where did gravity come from?Įarth’s gravity comes from all its mass. Some twenty years later, in 1686, he presented his three laws of motion in the “Principia Mathematica Philosophiae Naturalis.” The laws are shown above, and the application of these laws to aerodynamics are given on separate slides. He developed the theories of gravitation in 1666, when he was only 23 years old. For every action there is an equal and opposite reaction.Every object in a state of uniform motion will remain in that state of motion unless an external force acts on it.Newton’s three laws of motion may be stated as follows:
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