Compound Pendulum
A rigid body suspended from a fixed horizontal axis that oscillates under gravity about a pivot point.
Governing formula
T = 2π √(I / (m g d))
SI unit
s
In depth
Unlike a simple pendulum (mass concentrated at a point), a compound pendulum's period depends on the rigid body's rotational moment of inertia I and distance d from pivot to center of mass.
Examples in the real world
A grandfather clock's swinging wooden or brass pendulum arm.