Q. 194.0( 4 Votes )

How do you appreciate Pascal’s discovery in helping to make

hydraulic jacks.

Answer :

Hydraulic jacks-

The hydraulic jack is a device used for lifting heavy loads by the application of much smaller force. It is based on Pascal’s law. The Pascal's law states that the pressure at a point in a fluid at rest is the same in all directions.


The working principle of a hydraulic jack may be explained with the help of Figure Consider two piston with different surface area A1 & A2, operating in two cylinders of different diameters, which are interconnected at the bottom, through a chamber, which is filled with some liquid.


W= Weight to be lifted,

F1 = Force applied on piston 1,

A1 = Area piston 1.

A2 = Area of piston2.

F2 = Force applied on piston 2 = W.

Pressure intensity produced by the force F1,

As per Pascal’s law, the above intensity p will be equally transmitted in all directions.

Therefore, The pressure intensity on Piston2

Above Equation indicates that by applying a small force F1 on the Piston1, a large force W or F2 may be developed by the Piston2.

Hydraulic jack have many uses in our life some of them are following -

● It is used in Metal press work to press sheet metal to any required shape by applying pressure on it .

● As it can produce large force from small forces ,I can be used in Drawing and pushing rods.

● It can Bend and straight any metal piece.

● Many Packing press are uses hydraulic jack.

● Lifting up heavy cars .

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