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Pressure
IGCSE pressure facts
Question | Answer |
---|---|
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 |