4th law of motion by newton

Newton’s First Law of Motion also known as Law of Inertia states that every object persists to stay in uniform motion in a straight line or in the state of rest unless an external force acts upon it. In a simpler form, the first law of motion may also be stated as "If the net external force on a body is zero, its acceleration is zero. Acceleration can be non-zero only if there is a net external force on the body".
Newton’s Second Law of Motion states that force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration, i.e.
F = ma
Thus, {tex}\vec { F } \propto \frac { \Delta \vec { p } } { \Delta t } \text { or } \vec { F } = k \frac { \Delta \vec { p } } { \Delta t }{/tex}, where k is a constant of proportionality, {tex}\Delta p{/tex} is the change in momentum and p = mv.
Newton’s Third Law of Motion: It states that "For every action, there is an equal and opposite reaction".