Radian
the measure of a central angle subtending an arc equal in length to
the radius.
Torque
Something that produces or tends to produce torsion or rotation; the
moment of a force or system of forces tending to cause rotation.
Period
A round of time or series of years by which time is measured.
Rotational Motion
is a circular movement of an object around a center of rotation.
Centripetal Force
a force that keeps planets in orbit.
Centripetal Acceleration
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Hertz
the SI unit of frequency, equal to one cycle per second.
Frequency
the rate at which something occurs is repeated over a particular
period of time or in a given sample.
Circular Motion
is a movement of an object along the circumference of a circle or
rotation along a circular path.