###### Answer: action force and reaction force

In classical mechanics Newton’s laws of motion are three laws that describe the relationship between the motion of an object and the forces acting on it. The first law states that an object either remains at rest or continues to move at a constant velocity unless it is acted upon by an external force.

The second law states that the rate of change of momentum of an object is directly proportional to the force applied or for an object with constant mass that the net force on an object is equal to the mass of that object multiplied by the acceleration . The third law states that when one object exerts a force on a second object that second object exerts a force that is equal in magnitude and opposite in dire…

The second law states that the rate of change of momentum of an object is directly proportional to the force applied or for an object with constant mass that the net force on an object is equal to the mass of that object multiplied by the acceleration. The third law states that when one object exerts a force on a second object that second object exerts a force that is equal in magnitude and opposite in direction on the first object. The three laws of motion were first compiled by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) first published in 1687. Newton used them to explain and investigate the motion of many physical objects and systems which laid the foundation for Newtonian mechanics .

As described by the third of Newton’s laws of motion of classical mechanics all forces occur in pairs such that if one object exerts a forceon another object then the second object exerts an equal and opposite reaction force on the first. The third law is also more generally stated as: “To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal and directed to contrary parts.” The attribution of which of the two forces is the action and which is the reacti…

Reactive centrifugal force – Wikipedia

Newton’s laws of motion – Wikipedia

Reaction (physics) – Wikipedia

Newton’s laws of motion – Wikipedia

Newton’s laws of motion – Wikipedia

This fact known as the law of conservation of momentum is implied by Newton s laws of motion . Suppose for example that two particles interact. Because of the third law the forces between them are equal and opposite. If t…