Motion

 Defined by object's distance changing from the reference point

Reference Point

A place or object used for comparison to determine if an object is in motion

Speed

Distance traveled per unit time

Velocity

Speed and direction

Scalar

Describe only a number or magnitude

Vector

Described by a magnitude and direction

Acceleration

Rate of change of velocity

Force

Push or pull

Unbalanced force

Force(s) that produce a net force, which changes an object's motion

Balanced force

Equal forces acting on an object that results in no change in motion

Net Force

Total forces acting on an object

Inertia

The tendency of an object to resist changes in motion