###
ACCELERATION:

A change in velocity.

###
CENTRIFUGAL:

A term describing the tendency of objects in uniform circular motion
to move away from the center of the circular path. Though the term
"centrifugal force" is often used, it is inertia, rather
than force, that causes the object to move outward.

###
CENTRIPETAL FORCE:

The force that causes an object in uniform circular motion to move
toward the center of the circular path.

###
INERTIA:

The tendency of an object in motion to remain in motion, and of an
object at rest to remain at rest.

###
MASS:

A measure of inertia, indicating the resistance of an object to a
change in its motion—including a change in velocity.

###
SCALAR:

A quantity that possesses only magnitude, with no specific direction.
Mass, time, and speed are all scalars. A scalar is contrasted with a
vector.

###
SPEED:

The rate at which the position of an object changes over a given
period of time.

###
TANGENTIAL:

Movement along a tangent, or a line that touches a circle at just one
point and does not intersect the circle.

###
UNIFORM CIRCULAR MOTION:

The motion of an object around the center of a circle in such a manner
that speed is constant or unchanging.

###
VECTOR:

A quantity that possesses both magnitude and direction. Velocity,
acceleration, and weight (which involves the downward acceleration due
to gravity) are examples of vectors. It is contrasted with a scalar.

###
VELOCITY:

The speed of an object in a particular direction.

## Comment about this article, ask questions, or add new information about this topic: