Newton's Third Law of Motion

Newton's 3rd Law states that when two objects interact the forces they exert on each other are equal and opposite.This means that all forces exist as pairs.The forces must be of the same type and act on different or reciprocal objects.For example a person standing on the ground will experience a normal contact force perpendicular to the ground. There will be a contact force of the ground on the person and a contact force of the person on the ground and both forces will be equal in magnitude and will act in opposite directions.