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As the arm supporting the pendulum expands in the warmer temperatures of summer, so the swing distance slightly increases, so taking longer to swing and slowing down the clock. Back in the colder winter weather, the pendulum support contracts, getting slightly shorter. This increases the speed of the swing and the timing is increased. So in summer time slows down, and in winter time speed up. This is when adjustment is usually made to regain the correct time.

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Q: Why does a pendulum lose time in summer and gain time in winter?
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Why does a pendulum lose time in summer and gain in winter?

Time period of pendulum is, T= 2π*SQRT(L/g) In summer due to high temperature value of 'l' increases which increases the time period of pendulum clock. Hence, pendulum clock loses time in summer. In winter due to low temperature value of 'l' decreases which decreases the time period of pendulum clock. Hence, pendulum clock gains time in winter.


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Thicker hair is needed as a protection against the extreme cold of winter. The thick coat is shed in summer as the weather can be very warm.


Why does a pendulum eventually slow down and stop swinging?

The pendulum will lose energy, due to friction.


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