4.5.5.1.1 Pressure in a Fluid 1 Flashcards
1
Q
What can a fluid be?
A
- a fluid can either be a liquid or a gas
2
Q
What does pressure in fluids cause?
A
pressure in fluids cause a force normal (at rights angles) to any surface
3
Q
Formula for pressure:
A
- P = F/A
- Pressure = Force normal to the surface / Area of that surface
- Force (N)
- Area (m2)
- Pressure (N/m2) or (Pa - Pascal)
- 1Pa = 1N/m2
4
Q
The larger the SA…
A
the lower the pressure and vice versa
5
Q
Things which depend on low pressure:
A
- snow shoes
- bed of nails
- camel’s feet
- comfy chair
6
Q
Things which depend on high pressure:
A
- hypodermic syringe
- sharp knife
7
Q
How do particles of a gas act in a container?
A
- particles widely spaced and moving rapidly in constant random motion
- particles colliding with each other and with the walls of the container
- when the particles collide with the wall - they exert a force which acts at right angles to the wall (along the normal)
8
Q
How do particles of a liquid act in a container?
A
particles are exerting a force at right angles to the walls of the container
9
Q
Pressure:
A
force exerted per unit area
