April 28, 2015
Uniqueness of truth, Newton Mechanics, law of conservation of energy, Newton's second law, law of gravity
According to the principle of the uniqueness of truth, there should be only one
truth, namely law of conservation of energy, in the area of Newton Mechanics. Through
the example of free falling body, this paper derives the original Newton's second law and
the original law of gravity respectively by using the law of conservation of energy.