PRESSURE TEST:
The emphasis will be only in the basics. Here is some help for your studying.
You should be able understand following type topics/consepts:

Pressure: definition, unit, calculations (P = F/A)

Liquid pressure: Think everyday applications or experiments that would show that the following is true.

Pressure in liquid increases with depth ( P=dhg; d = density of liquid).

Pressure at one depth acts equally in all directions.

A liquid finds its own level.

Pressure depends on the density of the liquid.

Hydraulic principle; i.e. how to lift a car by taking the advatage of the fact that liquids are almost incompressable and therefore the pressure is transmitted in a liquid.

Atmospheric pressure:

demonstrations that show the existance of atmospheric pressure.

Ways to measure atmospehric pressure - basic working principles/ideas and names of some of the equipment.

Special attention: U-tube manometer and mercury barometer

Pressure is proportional to the difference of liquid levels in a tube. Take into account if the manometer is open or closed ended.

Floating, sinking and flying:

Fluid = liquid or gas

Archimedes'principle: Upthrust on an object is equal to the weight of the fluid replaced (F=dVg; d= density of fluid, V=how much fluid is displaced, i.e. is the object completely of partially submerged in the fluid.).

An object floats when it displaces its own weight of fluid.

This means that If the object is completely submerged in the fluid it will:

sink in the fluid if the density of the object is more than the denisty of the fluid.

float (not going downwards nor upwards) if the density of the object is the same as the density of the fluid.

float upwards in the fluid if the density of the object is less than the density of the fluid.

If the object is partially submerged in the fluid, i.e. it floats so that a part of it is above the fluid then:

weight of the whole object = weight of the fluid displaced

Fluid flow (Only the very basics is needed!)

Viscosity = "how easily fuids flow"

Fluids flow slowest next to the surface that surrounds the fluid (pipe walls, river banks,...)

Viscosity of fluids decreases as the temperature increases (Syrup flows faster when heated!).

Streamlining objects help them to move through fluids with minimum turbulence (Formula 1 cars, dolphins, ...)

Terminal velocity (skydivers jumping of the plane).

Bernoulli's principle: when fluids move faster then the pressure decreases. Think about everyday appications that use this principle. You see below some videos that help you to understand this principle.

PRESSURE VIDEOS

Pascal's Principle: Pressure is transmitted undiminished in an enclosed static fluid.

PRESSURE TEST:The emphasis will be only in the basics. Here is some help for your studying.

You should be able understand following type topics/consepts:

PRESSURE VIDEOS