# Why do 2 points on a mechanism not have the same angular velocities?

Could someone please explain me why the velocity of point P and P' aren't the same? Appearently it is because the angular velocity of point A and B aren't the same.

We are only given that the angular velocity of A is 10rad/s clockwise.

Why? I would think that, as these two elements are connected , they would all rotate with the same angular velocity. If A rotates with a speed of 10rad/s it would be logical for me that point B just follows and rotates with the same angular velocity.

• Hint: angular velocity is defined with respect to an origin. What are $P$ and $A$ 's radiuses about that origin? – Carl Witthoft Dec 23 '15 at 14:56
• @CarlWitthoft: The distance PA is 159.3mm. So point P and P' have the same distance to point A. – privetDruzia Dec 23 '15 at 15:05