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Engineering · L2 · How a Hydraulic Car Jack Multiplies Force

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Why the liquid has to be trapped and incompressible for a small push on a jack handle to become a much bigger lifting force.

by @openstemUpdated Engineering
🧑 Small push on jack handleSmall piston pushes into liquidIs the liquid trapped and incompressible?❌ Push gets absorbed, force is lost💧 Pressure spreads equally everywhereLarge piston feels the same pressure over a much bigger area🚗 Car lifts with far more force than the handle pushNo — it compresses, like airYes — sealed liquid

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