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# lab05 - The Physics of Light Sound LAB 05 THE PENDULUM...

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The Physics of Light & Sound Introduction One of the more important types of motion encountered in nature (responsible for the creation of sound, light, as well as other phenomena) is the oscillatory motion, i.e. the movement of an object (or group of objects) back and forth around an equilibrium position. One of the simpler systems one can use to study oscillatory motion is the so-called simple pendulum. In its most basic form a simple pendulum consists of a heavy object (called a bob) suspended on a string. The other end of the string is attached to a fixed support, as shown in Fig. 1. Among other things the simple pendulum can be used to measure time. In this experiment you will study the dependence of the period (the time it takes to complete a cycle) of a simple pendulum on the length of the string and the mass of the bob. Formulae For small oscillations the period (defined as the time needed to complete a full oscillation) of the simple pendulum is given by: T = 1 f = 2 π l g (1)

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