Force and Motion

A system of objects that are not moving with respect to one another.

the speed and direction of a moving object

The rate (time) at which velocity (speed + direction) changes.

distance travelled per unit of time (mph)

The product of an object's mass (measured in grams) times velocity (speed and direction).

Forces that cause a change in the motion of an object.

forces acting on an object that combine and form a net force of zero

A force that pulls objects toward each other

A force that opposes motion between two surfaces that are in contact

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.