Answer:
Newton's third law states that for every action, there is an equal and opposite reaction. This means that in any interaction between two objects, the force exerted by one object on the other is matched by a force exerted by the other object in the opposite direction. This is true for all types of interactions, including collisions.
In a collision, the forces exerted by the two objects on each other are called force pairs. These forces are equal in magnitude and opposite in direction, as required by Newton's third law. For example, if two objects collide and one exerts a force of 10 newtons on the other, the other object will exert a force of 10 newtons back on the first object. This ensures that the total force on each object is zero, and the objects will either remain at rest or move with a constant velocity after the collision.