Goal: Reason with rotational dynamics.
A spool has string wrapped around its center axle and is sitting on a
horizontal surface. If the string is pulled in the horizontal direction
when tangent to the bottom of the axle, the spool will
- roll to the right.
- not roll, only slip.
- roll to the left.
- can’t be determined.
(1) For many students this is really counterintuitive.