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Ball bearings place small spheres between two rings, letting one ring roll over the other instead of sliding. This reduces friction and helps keep machinery from overheating.
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A heavy rotor stores energy by spinning rapidly, like a mechanical battery. Suspending it on magnetic bearings in a vacuum reduces friction; when power is…
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Tension cables suspend the rigid bars without letting them rest on one another; opposing pulls hold the structure in balance.
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A force on a rapidly spinning rotor produces motion at right angles to the force, a response called gyroscopic precession. Helicopters need mechanical…
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As the blades pass tightly together, they trap the material between them and shear it apart.
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A spinning vat of toxic liquid mercury naturally forms a parabolic reflective surface, avoiding the costly grinding required for giant glass mirrors.
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A mechanical metronome uses an adjustable pendulum: sliding its weight closer to the pivot speeds up the beat, while moving it farther away slows it down.
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