Phys 3, Section 2				October 4, 1996

ROTATIONAL EQUILIBRIUM

Second Law of Equilibrium:

Torque: Measure of rotational effect caused by a force applied off-center from a pivot point

Moment Arm: Perpendicular distance between line-of-action of a force and a pivot point r

Equilibrium: This requires that a body be in both translational and rotational equilibrium

Three Conditions for Equilibrium:

CENTER-OF-GRAVITY

Center-of-Gravity

Location where all the weight of an object can be imagined to act

Types of Equilibrium:

Stable, unstable, and neutral. (What is the effect of a small perturbation?)