Hydraulics Flashcards
If a force is acting over a small area, what size of pressure is produced?
High
Why does a larger area result in a lower pressure?
The pressure is spread out instead of concentrated at one point
How do you work out pressure (Pa or N/m2)?
force (N) / area (m2)
What direction does pressure in a liquid act in?
All directions
When does pressure in a liquid increase?
As the liquid increases in depth
What can a liquid be used for in a hydraulic system?
To transmit pressure and movement from one part to another without linking the parts mechanically
What is a hydraulic system made up of?
Two pistons linked via a pipe carrying hydraulic fluid
What two pistons are used in a hydraulic brake system?
Small master piston and a bigger slave piston
How does a hydraulic brake system work?
The master piston is used to apply a force. This puts the liquid under pressure, which is transmitted to pistons on all four wheels of the car.
In a hydraulic brake system, how do you work out the pressure produced by pushing on the brake?
force by foot on pedal / area of small piston
In a hydraulic brake system, how do you work out the pressure produced on the brake, so also on the wheel?
force by foot on pedal / area of small piston = force on wheel / area of large piston
In a hydraulic brake system, how do you work out the force produced on the wheel?
(force by foot on pedal / area of small piston) X area of large piston
What happens in a hydraulic system?
A force on a piston exerts pressure in a liquid and the force is transferred to a piston on the other end of the system.
What does changing the area of a piston change as well?
The size of the outward force
How do you work out the energy transferred?
force X distance moved by the force
