Notation r, ω and α are for rotation,
where r is radius, ω is angular speed, α is angular acceleration.
Imagine an object with r from rotation axial on a spinning disk
with angular speed ω, angular acceleration α.
There will be both centripetal acceleration a(c) and tangential acceleration a(t).
Centripetal Acceleration a(t) = r * α
Tangential Acceleration a(c) = ω² * r
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Notation r, ω and α are for rotation,
where r is radius, ω is angular speed, α is angular acceleration.
Imagine an object with r from rotation axial on a spinning disk
with angular speed ω, angular acceleration α.
There will be both centripetal acceleration a(c) and tangential acceleration a(t).
Centripetal Acceleration a(t) = r * α
Tangential Acceleration a(c) = ω² * r
Choose a best answer for your question: 3 points Award
http://ca.answers.yahoo.com/info/scoring_system