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# Pressure

### IGCSE pressure facts

Units of force Newtons
Units of area metres squared (or cm squared)
Units of pressure Pascals, Pa (aka Newtons per metre squared)
Pressure = ? force/area
Incompressible means ... can't be squashed.
At the same depth under water, pressure is the same in ... all directions
Hydraulic systems use liquid to transfer.. pressure from one place to another.
In a hydraulic system, if the area of the piston is bigger then the force is .. bigger.
Hydraulic brakes are force.. multipliers.
In hydraulic brakes the pistons that squeeze the brakes onto the discs have a bigger .. area than the piston in the master cylinder behind the brake pedal.
In a force multiplier system the effort force (input) is smaller than .. the load force (output).
In a car workshop vehicles can be raised with a hydraulic.. lift.
A hydraulic press can be used to .. squash or bend e.g. metal bars.
The deeper you go under water the greater the .. pressure.
force = pressure .... times area.
The pressure under my feet is 0.4 N per square cm. The area of my feet is 150 square cm. What is my weight? weight force = pressure times area = 60 N
I push with an effort force of 200 N on a piston area 5 square cm. What is the pressure? 200/5 = 40 Newtons per square cm.
If the brake pistons have an a total area 20 times the area of the piston behind the car brake pedal, and I push on the pedal with an effort of 30 N. What is the braking force? Braking force is 20 times effort force = 600N
The oil pressure in a hydraulic lift is 600 N per square cm. The load piston area is 10 square cm. What is the greatest load that can be lifted? load force = pressure times area = 6000 N
On Earth gravity is 10 N/kg. What is the weight of a child mass 40 kg? 40 x 10 = 400 Newton
Created by: waslancing