Action force - one of the pair of forces described in Newton’s 3rd law.

Interaction - a mutual action between objects where each object exerts an equal and opposite force on the other.

Reaction force - the force that is equal in strength and opposite in direction to the action force, which acts simultaneously on whatever is exerting the action force.

Newton's 3rd Law - whenever one body exerts a force on a second body, the second body exerts an equal and opposite force on the first.

Force - Any influence that tends to accelerate an object: a push or a pull.

Mass - The amount of matter in an object: a measure of an object’s inertia.

Net force - The combination of all the forces that act on an object.

Volume - The amount of space an object occupies.

Acceleration - The rate at which velocity changes.