![]() ![]() There is the force of gravity that acts downward upon the bob. ![]() So what forces act upon a pendulum bob? And what is the restoring force for a pendulum? There are two dominant forces acting upon a pendulum bob at all times during the course of its motion. It is this restoring force that is responsible for the vibration. The restoring force causes the vibrating object to slow down as it moves away from the equilibrium position and to speed up as it approaches the equilibrium position. Such quantities will include forces, position, velocity and energy - both kinetic and potential energy.Įarlier in this lesson we learned that an object that is vibrating is acted upon by a restoring force. Here we will investigate pendulum motion in even greater detail as we focus upon how a variety of quantities change over the course of time. ![]() Pendulum motion was discussed again as we looked at the mathematical properties of objects that are in periodic motion. Pendulum motion was introduced earlier in this lesson as we made an attempt to understand the nature of vibrating objects. The motion is regular and repeating, an example of periodic motion. When the bob is displaced from equilibrium and then released, it begins its back and forth vibration about its fixed equilibrium position. The massive object is affectionately referred to as the pendulum bob. It typically hangs vertically in its equilibrium position. A simple pendulum consists of a relatively massive object hung by a string from a fixed support. ![]()
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