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Homework Statement
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?
Right so if you were to draw the two velocity tangents and then find the change in velocity, it would point towards the center of rotation. So which acceleration is zero?velocity is changing. If that is changing, acceleration is also changing?
That would be correct.Normal acceleration is always towards the fixed point. The normal one?
tangential acceleration is related to α by a_{tangential}=αrCan you give a summary on how to determine which is zero among the two in different situations?
How can I determine the tangential acceleration if I have given the angular velocity?
no no, the only way for your normal acceleration to be zero is if the object is not spinning. Remember a=ω^{2}rso, if normal is zero, then tangential equals the angular acceleration. I only depend on the tangential and normal formula.
You mean a sliding block on a curved surface? No, the normal is not zero. In that case there is still a normal acceleration.so normal is zero in a sliding block?
Once your object is basically rotating with respect to some point, there will be a normal acceleration.i mean in a mechanism, in a flat surface. the sliding block has zero normal? I'll be back.
ok, what sort of mechanism are you talking about?I mean in a mechanism, the sliding block, the normal in a flat surface is zero?
Can you post a picture of the schematic?its only a sample, only a schematic drawing.
If your surface is flat in that manner, then there is no normal acceleration.its only a sketch angular velocity at 2 is constant