ABSTRACT
A simple gravity pendulum: A massless string with one end attached to a weight and the other end fixed. When an initial push is given, the pendulum will swing back and forth under the influence of gravity. A rotational suspended system: A rigid body is suspended by two massless strings/hangers of equal length, fixed at the same point and the body rotates about the fixed point in the plane of the strings. A translational suspended system: A rigid body is suspended by two parallel and vertical massless strings/hangers with equal length and the strings rotate about their own fixed points. Thus, the rigid body moves parallel to its static position in the plane of the strings.
