Which is equal to zero if angular velocity is constant, normal or tangential acceleration?
The one with zero angular velocity is a crank. The crank moves at a fixed point.
But it is not changing speed, the angular velocity is the same.I think it is the tangential one because that means it is a uniform motion but continuously changing speed? is that correct?
Yes. So would the tangential velocity be changing is α is defined as α=dω/dt ? Since the direction of the tangential velocity is changing what does that say about acceleration?sorry it should be constant velocity. changing direction but constant speed, right?