Answer: Three laws of motion and gravity
Explanation: Newton's contribution to physics is reflected in three laws of motion and gravity. The first of the three laws of motion is about inertia, that is, every body will remain in a state of being, whether it is stationary or moving, until it is acted upon by an external force that will change that uniform state.
The second law is about the relation of force, mass and acceleration, that is, force is equal to mass times acceleration, in other words force to mass gives acceleration.
The third law is the law of action and reaction, that is, to every body acting by some force upon another body, that other body acting by the same force upon the first one.
The law of gravity refers to the force by which the Earth, thanks its mass, acts on all the bodies in its atmosphere. This law applies to all celestial bodies with a mass large enough, such as Earth, to be able to attract other bodies, that is, they can act by gravity.
