Newton was able to sum up the description of the phenomena of mechanics and gravitation in three laws of motion and law of universal gravitation. This is the first and perhaps biggest, unification of scientific knowledge. In a few laws expressed in mathematical form, describes a large number of natural phenomena.
1) a 'principle of dynamic or principle of inertia (already discovered by Galileo) Means a body not subject to forces moves with constant velocity (in intensity, direction and orientation) with respect to a inertial reference system.
2) 2 ' principle of dynamics: a force acting on a body gives him an acceleration (change in velocity) proportional to the force itself (the coefficient of proportionality is called the mass). The principle is expressed mathematically by the formula F = m · to.
3) principle of action and reaction : for every force is an opposing force ( equal in intensity and direction, but in opposite direction).
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