Pendulums are often used in clocks to power the gears that move the hands. However, most clocks built today often have pendulums only for show, as those types of clocks are usually inaccurate and require a lot of winding.
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The simple pendulum can be used to determine the acceleration due to gravity.
The pendulum swings both ways. Pendulum exercises are used to increase your ROM after shoulder surgery.
Making the length of the pendulum longer. Also, reducing gravitation (that is, using the pendulum on a low-gravity world would also increase the period).
Pendulum
Not in the theoretical world, in the practical world: just a very little. The period is determined primarily by the length of the pendulum. If the rod is not a very small fraction of the mass of the bob then the mass center of the rod will have to be taken into account when calculating the "length" of the pendulum.