acceleration:

is the rate of change of velocity in a function of time.

action force:

one the pair of force described in newton's 3rd law.

force:

Any influence that tends to accelerate an objet: a push or a pull.

interaction:

A mutual action between objects where each object exerts an egual and opposite force on the other.

law:

A hypothesis that has been tested over and over again and not contradacted.

Newton's 3rd Law:

Whenever on body exerts a force on a second body, the second body exerts an equal and opposite force on the first.

mass:

The amount of matter in an objet: a measure of an object's inertia.

motion:

any physical movement or change in position or place, rest or moving.

reaction force:

the force that is egual in strenght and opposite in direction to the action force, which acts simultaneously on whatever is exerting the action force.

velocity:

is a vector measurement of the rate and direction of motion.

weight:

A measure of the heaviness of an object. The force with which a body is attracted a body.