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   ocr: Why aren t gears perfect? Ifthe gears on the pinball game worked pertectly, then all the energy carried by the gears would transter to the cog. In real life, no gears work like this. All gears have imperfections that make them lose some of their energy. Friction - a force that resists motion - 1s the main reason that gears lose energy. Most friction is created when the gear surfaces touch and move over each other. Gears also create triction as they move through the air. Gears create. less friction if their surtaces are smooth and free of dirt, and: if theyre covered in a lubricant such as grea ...