Two cylinders ( vertically placed, different cross-sectional areas ) are constructed with a liquid in the tube ( horizontal ) connecting them. The cylinders have movable pistons with bases, one to place the car and another to push with your hand.

Say, the area of the base on which the car is placed is A

_{1}and the area of the base you are pushing is A

_{2}.

Let F

_{1}be the force applied to the car as a result of your pushing with the force F

_{2}.

From Pascal's Law,

F

_{1}/A

_{1}= F

_{2}/A

_{2}

or

F

_{2}= F

_{1}* A

_{2}/A

_{1}

So if A

_{1}is much larger than A

_{2}, F

_{2}is quite small, and so, a very small force is required on your part to lift the whole car.

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