A heavy wheel or disc attached to a rotating shaft that stores energy and helps smooth out motion in machinery or vehicles.
Compound of 'fly' (in the sense of rapid motion) and 'wheel,' a mechanical term from the 19th century referring to the spinning component that regulates motion.
Flywheels are in car engines and gym equipment—they store kinetic energy like a spinning top, which is why stationary bikes with heavy flywheels feel so smooth and give you momentum!
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