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Rotating Object - zero KE

by esmeralda4
Tags: object, rotating
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Sep6-13, 05:45 AM
P: 52

Since velocity is a vector quantity I assume it follows that KE must also by a vector since KE=1/2mv squared.

Is it true to say a rotating object has zero total velocity since + = - and therefore the total KE is zero?

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Sep6-13, 05:56 AM
jtbell's Avatar
P: 11,781
No, because kinetic energy is not a vector quantity. It is a scalar. Think of the ##v^2## as coming from the vector dot product of the velocity with itself: ##v^2 = \vec v \cdot \vec v = v_x^2 + v_y^2 + v_z^2##.

There is such a thing as rotational kinetic energy.

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