Does a rotating rigid body has single angular velocity.

[Ahsan Khan]

Hello all,

First of all I want to mention what believe or result of concepts, do I hold about rotational motion especially about the angular velocity. I assume that unlike velocity angular velocity has to worked out from some point. I will begin with particle for this I assume that the question of finding the angular velocity of a particle is meaningless unless it is told from what point angular velocity has to be worked since what I think is that a given rotatating particle can have different angular velocities when calculated from different points. Correct me if i am wrong here.I am holding also the similar view for rigid body that when a rigid body is rotating about some axis then the angular velocity of all points on body will be the same when the angular velocity is observed from the point of axis of rotation. But the about some points exist on other than axis of rotation the different points of the rigid body will have in general different angular velocities.

Are these my views consistent with the reality?

Regards

 

[.Scott]

Regards

The angular velocity is always taken about the rotation axis. Also, the angular velocity is a vector that points along the axis of rotation - the right-hand rule is used:

Angular velocity is the rate of angular displacement about an axis. Its direction is determined by right hand rule. According to right hand rule, if you hold the axis with your right hand and rotate the fingers in the direction of motion of the rotating body then thumb will point the direction of the angular velocity.

 

[Ahsan Khan]

The angular velocity is always taken about the rotation axis.

Do you mean we can't or atleast don't talk about angular velocity of body about points that do not exist on axis of rotation?

 

[A.T.]

Do you mean we can't or atleast don't talk about angular velocity of body about points that do not exist on axis of rotation?

You can assume another parallel axis plus circular translation, but the angular velocity will be still the same.