Strike a billiard ball so it rolls w/o slipping?
If we use the line of action of
the impulse as the fulcrum,
there are NO torques !
The angular momentum is the same before and after the impulse.
Speed at which a sliding ball rolls w/o slipping ?
at release
alley exerts
friction
rolls w/o
slipping
Use conservation of angular momentum about the point-of contact
with the floor, so there are no torques.