Simple pendulum = idealized model consisting of a point mass suspended by a massless, unstretchable string. Path of point mass is the arc of a circle with radius equal to the length of the string. Not harmonic since the restoring force is not directly proportional to or ( ) When the maximum angular displacement (amplitude) is not small: Moment of inertia of the body about the axis of rotation through is. As seen above, for spring-mass system is replaced with. Restoring torque is clockwise when displacement is counterclockwise and vice versa. Physical pendulum = any real pendulum that uses an extended body. Vs simple pendulum, where all its mass is concentrated at a point. Damping = decrease in amplitude caused by dissipative forces. Damped oscillation = the motion due to damping. Frictional damping force directly proportional to the velocity of the oscillating body: is a constant that describes the strength of damping force.
