A simple pendulum oscillates in the vertical plane due to gravity

A simple - or mathematical - pendulum consists of a rigid body suspended from a fixed horizontal axis about which the body may oscillate in a vertical plane due to the action of gravity.

simple pendulum ocillating due to gravity

The oscillating period for the simple pendulum can be calculated as

T = 2 π (l / ag)1/2              (1)


T = oscillating period for one cycle (s)

l = length of the pendulum (m, ft)

ag = acceleration of gravity (9.81 m/s2, 32.17 ft/s2)

Example - Calculate the length of a pendulum with an oscillating period of 1 sec, 10 sec and 100 sec

The length of a pendulum with a given oscillating period can be calculated by transforming (1) to:

l = (T / (2 π))2 g

Length for 1 sec:

I = ((1 s) / (2 π))2 (9.81 m/s2)

  = 0.249 (m)

Length for 10 sec:

I = ((10 s) / (2 π))2 (9.81 m/s2)

  = 24.9 (m)

Length for 100 sec:

I = ((100 s) / (2 π))2 (9.81 m/s2)

  = 2487 (m)

Four Types Of Pendulums

It is common to differentiate between four types of pendulums:

  1. Compound or Physical Pendulum - A rigid body suspended from a fixed horizontal axis. The body may oscillate in a vertical plane due to the action of gravity. 
  2. Simple or Mathematical Pendulum - Similar to the compound or physical pendulum but the mass is concentrated in a single point and oscillates back and forth in the vertical plane. The mass point is connected to a horizontal axis with a weightless chord.
  3. Conical Pendulum - Similar to the simple pendulum except that the weight suspended by the chord moves in uniform speed around the circumference of a circle in the horizontal plane.
  4. Torsional Pendulum - A disk fixed to a slender rod. The rod is fastened to a fixed frame. If the disk is twisted it will oscillate back and forth about the axis of the rod.

Related Topics

  • Dynamics - Motion - velocity and acceleration, forces and torques

Related Documents

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