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Is hydraulic jack violation of thoermodynamics

  1. Jan 6, 2015 #1
    when i use hydralick jack to lift up my car i put less energy and pick up heavey car ,so am i geting more by puting less in a hydralick system?
     
  2. jcsd
  3. Jan 6, 2015 #2

    HallsofIvy

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    You are confusing "force" with "energy". When you move the jack handle down, say one foot while the car goes up 1/2 inch then, since "energy" is "distance times force", (1/2)F= (12)f so that f= (1/24)F. To get the same energy you need only apply 1/24 the force. There is a "conservation of energy" law but there is no "conservation of force".
     
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