Calculating Angular Displacement of Ball Bearing

[alex_boothby]

hi,

how do i work out the angular displacement of ball bearing 0.00765 m in radius over 0.05 meters?

i need it to work out angular speed.


thank you

 

[Doc Al]

Perhaps you need:

$$d = \theta r$$

$$v = \omega r$$

Where the angle is measured in radians.

 

[alex_boothby]

im doing this piece of work about a ball bearing rolling down an invlined slope and translational kinetic energy + rotational kinetic energy should = potential enegry.

but I am not sure how to work out rotational kinetic energy. I am not sure of the equations you just gave me, sorry, a little more help maybe?

can i not just say that the angular displacement is 0.05 meters? as that is how much we moved the ball bearing back each time?

thank you, but could i please have a little more help?