what are some precautions that should be taken when measuring the length and period of a pendulum
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In a simple pendulum, the motion is simple harmonic for small amplitude (or angles). So, care should be taken to have small oscillations. The length of the pendulum should be considered entire thread till the centre of mass of the bob( including the radius of the bob if it is spherical). Though the period is not dependent on the weight of the mass of the pendulum, the weight of the bob must keep the thread straight without slackness. It is better the thread is thin weightless and sufficiently long.
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