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10111051011304GravityGravity is one of the fundamental forces of nature. The other forces discussed previously, such as friction, tension, and the normal force, are derived from the electric force, another of the fundamental forces. Gravity is a rather weak force unless the objects involved are large, like planets or stars. The electric force between two protons is much, much stronger than the gravitational force between them. Most of what we know about gravity came from studies of the motion of the Moon and the planets.
The Law of Gravity Isaac Newton deduced that two particles of masses m
Michael Browne: Schaum's Outline of Physics for Engineering and Science, Third Edition. Gravity, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export