Why the time period increasing while swinging closer to the middle hole (think about
torque)?
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A pendulum's period is related to its length, but the relationship is not linear. A pendulum that is twice as long as another pendulum does not simply have a period that is also twice as long. The exact periods of your longer and shorter pendulums may be slightly less than 1.7 seconds and 1.2 seconds, respectively, because of friction and because their lengths were less than 70 cm and 35 cm (due to strings being used to tie to attachments).
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