Physics P3 2.5 Hydraulics.

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What is the equation for pressure?
P = F over A (look up).
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In the equation for pressure, what is P?
The pressure in pascals (Pa) or M/m^2.
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In the equation for pressure, what is F?
The force in newtons (N).
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In the equation for pressure, what is A?
The cross-sectional area at right angles to the direction of the force in metres squares (m^2).
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How are liquids made use of in hydraulic pressure systems?
Liquids are virtually incompressible and the pressure in a liquid is transmitted equally in all directions, this means that a force exerted at one point of a liquid will be transmitted to other points in the liquid.
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What does the force exerted by a hydraulic pressure system depend on?
The force exerted on the system, the area of the cylinder on which this force acts on and the area of the cylinder that exerts the force.
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What effect does the use of different cross-sectional areas on the effort and load sides of a hydraulic system have?
It means that the system can be used as a force multiplier, therefore a small effort can be used to move a large load.
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How does the pressure in a fluid act?
It acts equally in all directions.
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What does a hydraulic system use the pressure in a fluid to do?
Exert a force.
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What is the pressure exerted on the ground by a person of weight 300 N if the area of their feet in contact with the ground is 0.04 m^2?
7500 Pa.
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What properties of a liquid make it useful in a hydraulic system?
Liquids are virtually incompressible, and the pressure in a liquid is transmitted equally in all directions.
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**REMEMBER THAT A HYDRAULIC PRESSURE SYSTEM IS USUALLY USED AS A FORCE MULTIPLIER, SO IF YOU CALCULATE THAT THE FORCE PRODUCED BY SUCH A SYSTEM IS LESS THAN THE EFFORT APPLIED TO THE SYSTEM YOU HAVE MADE A MISTAKE**
**LOOK UP AND PRACTICE EQUATIONS FOR PRESSURE**
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**LOOK UP DIAGRAM OF A HYDRAULIC CAR JACK AND HOW IT WORKS**
**
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Card 2

Front

In the equation for pressure, what is P?

Back

The pressure in pascals (Pa) or M/m^2.

Card 3

Front

In the equation for pressure, what is F?

Back

Preview of the front of card 3

Card 4

Front

In the equation for pressure, what is A?

Back

Preview of the front of card 4

Card 5

Front

How are liquids made use of in hydraulic pressure systems?

Back

Preview of the front of card 5
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