The main achievements Galilee in the classical mechanics -

The first law of motion (which later Newton will generalize in his laws)

Law of Inertia: Every body's center of mass continues in its state of rest, or of uniform motion in a right [straight] line, unless it is compelled to change that state by forces impressed upon it.

Effective support of Copernicus ideas

In 1600, astronomers were engaged in a great debate between the Copernican system (the planets revolved around the Sun) and the geocentric system (the planets and Sun revolved around Earth). In 1604, Galileo announced his support for the Copernican school of thought, but he lacked the means to reinforce the opinion.

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