00:00What mechanism is this? This is called a perpetual pendulum. It looks like a
00:05pendulum that keeps swinging again and again without stopping. Simple concept
00:11explanation. The pendulum swings because of gravity pulling it down. As it moves
00:16the bar or rod connected in the middle shifts the center of mass. This shifting
00:22gives the pendulum a small push on every swing. It looks like it will swing
00:26forever but in reality friction and air resistance slowly reduce the motion so
00:33it is not truly perpetual but a clever physics demonstration. Where is it used?
00:38This type of model is commonly used to teach gravity and oscillation. Please
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