resistance of any physical object to any change in its state of motion (moving or still)

Force caused by one object rubbing against another.

A push or a pull of an object resulting from the object's interaction with another object.

The overall force acting on an object; the sum of all forces acting on an object.

Two forces that are equal in size and opposite in direction.

The force applied to an object by a person or another object.

An unopposable force that causes a change in motion.

An object stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

The strength of a force is equal to the amount of mass involved multiplied by any acceleration applied to it. F=ma

For every action there is an equal and opposite reaction.

A single vector that is the equivalent of a set of vectors.

Unit used to measure force. (N=Kg X m/s2)

The friction occurring when rubbing one object against another object.

The friction between a wheel and another surface.

The friction opposing motion in a fluid and gas.