Newton’s third law of motion

When two objects interact, each exerts a force on the other. Newton’s third law states that these two forces act simultaneously and are equal in magnitude but opposite in direction.

For example, when you push on a wall, your hand exerts a force on the wall. At the same time, the wall exerts an equally large force in the opposite direction on your hand. These forces form an interaction pair.

The forces do not cancel as forces on a single object: one acts on the wall, while the other acts on your hand. To find the total force on either object, consider only the forces acting on that object.