Newton's Law Of Motion

Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.

Newton's First Law Of Motion:

Every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force .

(Assuming rightward is the positive direction. Newton's first law says that if the net force on an object is zero ( Σ F = 0 \Sigma F=0 ΣF=0\Sigma, F, equals, 0), then that object will have zero acceleration. That doesn't necessarily mean the object is at rest, but it means that the velocity is constant.)

Newton's Second Law Of Motion:

The rate of change of momentum of a body is directly proportional to the force applied, and this change in momentum takes place in the direction of the applied force.

(  F= m*a - where F=Force, m=mass, a=acceleration )

Newton's Third Law Of Motion:

For every action (force) in nature there is an equal and opposite reaction

(If one object A exerts a force F_A on a second object B, then B simultaneously exerts a force F_B on A, and the two forces are equal in magnitude and opposite in direction: F_A = −F_B. )