Rotational Motion
Class 11 · Rotational Motion
Rolling With Slipping
Independent v and ω — detect skidding (v > ωR) vs spinning (ωR > v) vs pure rolling.
Key Notes
01
Pure rolling: contact point is instantaneously at rest, so v = ωR.
02
Skidding: v > ωR (over-braking, locked wheel sliding).
03
Spinning: ωR > v (drive wheel spinning out, e.g. on ice).
04
Slipping speed at contact: v_slip = v − ωR.
Formulas
Pure rolling condition
Contact point at rest.
Slip velocity
Relative speed at contact.
Important Points
Friction acts to oppose slip: forward friction during spinning, backward during skidding.
Once pure rolling is reached on a flat surface, friction does no work.
Rolling With Slipping notes from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 11 physics revision for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG.