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The idea in having a more massive pendulum is so that it is less affected by air resistance. If two pendulums are set up and are indetical in every way except the mass of one of them, if they are both swung in air from the same starting height, the more massive one will swing for a longer period of time. The more mass a pendulum has, the more energy it takes to lift it to a given starting height. That energy is expressed in its motion when it is released. A very light pendulum of the same dimentions and in the same set up will not require very much energy to be raised to that same starting height as the heavier one. The air resistance the both pendulums encounter will be the same (assuming identical set ups), but that energy loss due to drag will represent a much smaller fraction of the energy of the pendulum with more mass. That means the more massive pendulum will be less affected. Picture a pendulum made by attaching a ping pong ball to a string. Now picture the same set up with a ball the same size, but made out of wood. Or even steel. More mass equals less effect due to air resistance.

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