3.1 Pressure Flashcards
(18 cards)
Elastic material:
A material that can be stretched or compressed and spontaneously reform to its normal shape.
Plastic material:
A material that can be streched and compressed and hold its new shape.
Limit of proportionality:
The point beyond which the extension is no longer proportional to the load.
Elastic limit:
The limit to which an object can be streched or compressed without permanent deformation of its normal shape.
Hooke’s law:
The extension is directly proportional to the force applied.
Equasion for load (F):
Load = Spring Constant x Extenstion (F = k x)
Equasion for extension (X):
Extension = Deformed length - Origional Length (X = L - Lo)
Pressure equasion:
Pressure = Force / Area (P = f / a)
1 Pa =
1n/m^2
Behaviour of pressure in liquids:
- Pressure acts in all directions.
- Pressure increases with depth.
- Pressure depends on liquid density.
- Pressure does not depend on the shape of the container.
- Pressure is not affected by volume.
Pressure in liquids formula:
Pressure = Liquid density x g x depth (P = p g h)
Pressure in liquids formula for a change in depth:
Pressure = Liquid density x g x change in depth (P = p g Delta-h)
Standard atmospheric pressure supports a __ mm column of mercury.
760mm
Standard atmospheric pressure is equivalent to __ Pa.
10 000 Pa
Factors affecting a fixed mass of gas:
- Pressure
- Volume
- Temperature
Boyle’s law:
For a fixed mass of gas at a constant temperature, the pressure is inversely proportional to the volume.
Boyle’s law equasion:
p1 x v1 = p2 x v2
An ideal gas is:
A gas that obeys Boyle’s law.
