4.5.5 Pressure and pressure differences in fluids

You will need to use a combination of the materials we have collected here to enable you to succeed. The most important factor will always be your effort. Use the knowledge of your teacher, attend revision sessions, ask when you need help. Most importantly of all, stay confident! You can do this!

Learning Checklist & Knowledge Organiser

4.5.5 Pressure and pressure differences in fluids

Describe a fluid as either a liquid or a gas and explain that the pressure in a fluid causes a force to act at right angles (normal) to the surface of its container
Recall and apply the equation: [ p = F/A ]
Explain why the pressure at a point in a fluid increases with the height of the column of fluid above and calculate differences in pressure in a liquid by applying [ p = h ρ g ]
Describe up thrust an object and explain why the density of the fluid has an effect on the up thrust experienced by an object submerged in it
Explain why an object floats or sinks, with reference to its weight, volume and the up thrust it experiences
Describe a simple model of the Earth's atmosphere and of atmospheric pressure, explaining why atmospheric pressure varies with height above a surface