### Newton's Second Law for Rotation

**Statement of Newton's Second Law for
Rotation: ** Σ**τ** = I
**α**

**Very important: this equation is ***strongly* origin
dependent!!

Basic facts about angular acceleration. The angular acceleration is:

- proportional to the net torque (a &prop F);
- inversely proportional to the moment of inertia (a &prop 1/m);
- proportional to the inverse of the mass;
- proportional to the inverse square of the size of the object