Rotational Motion
Class 11 · Rotational Motion

Linear ↔ Angular Variables

v = ωr, a_t = αr, a_c = ω²r — drag a particle on a rotating disc to see all three.

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Key Notes

01

Each particle on a rotating rigid body has linear velocity v = ωr.

02

Tangential acceleration a_t = αr; centripetal a_c = ω²r = v²/r.

03

Different points on the same body share ω and α, but have different v and a_c.

Formulas

Linear-angular

Connects circular and rotational kinematics.

Important Points

Total acceleration = √(a_t² + a_c²).

On a wheel rolling without slipping, the topmost point moves at 2v relative to ground.

Linear ↔ Angular Variables 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.