5 Solids Liquids Gases- Part B “Density and Pressure”
Syllabus Aims…
5.3 know and use the relationship between density, mass and volume:
density = mass / volume
ρ = m / V
5.4 practical: investigate density using direct measurements of mass and volume.
5.5 know and use the relationship between pressure, force and area:
pressure = force / area
p = F / A
5.6 understand that the pressure at a point in a gas or liquid which is at rest acts equally in all directions
5.7 know and use the relationship for pressure difference:
pressure difference = height × density × gravitational field strength
p = h × ρ × g
Resources…
Use this PowerPoint for a quick review…5 SLG Part B Density and Pressure
Density Learning Check
Density Practical Booklet Y11
Density Problems Sheet 1
Worksheet Investigating pressure
Analysis Sheet Pressure in Fluid
Useful Videos…
Archemedes inventions : Golden crown in water bath
Ancient greek mathematician, physicist, engineer, inventor, and astronomer Archimedes invents through the past to nowdays.
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Archemedes inventions : Golden crown in water bath
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Ancient greek mathematician, physicist, engineer, inventor, and astronomer Archimedes invents through the past to nowdays.
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Density - GCSE Science Required Practical
Mr Rees shows you how to calculate the density of regular and irregular [...]
Mr Rees shows you how to calculate the density of regular and irregular objects using a Eureka can and Vernier caliper, as well as calculating the concentration of a solution.
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00:00 Density equation
01:02 Regular objects
02:30 Vernier calliper
04:06 Irregular objects - Eureka/displacement can
07:25 Density of solutions & concentrationShow More 
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GCSE Physics - What is Pressure? #48
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This is a quick video to show how the gas pressure on a plane is lower than atmospheric!
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Hydraulics | GCSE Physics | Doodle Science
GCSE Science Doodle Science teaches you high school physics in a less [...]
GCSE Science
Doodle Science teaches you high school physics in a less boring way in almost no time!
Follow me: https://twitter.com/DoodleSci
You can support me at: https://patreon.com/doodlescience
Script:
Hydraulics might sound complicated but all they are, is another force multiplier. They utilise the fact that liquids are virtually incompressible, which means when you compress them, the pressure you apply to one point of the liquid is transmitted equally in all directions.
For example if you have a balloon with a few holes in it and you squeeze the top of the balloon, the water will squirt out of all of the holes. This shows that the pressure applied at the top of the balloon must have been transmitted equally to all other parts of the liquid.
In order to work with hydraulics, the equation Pressure = Force/ Cross sectional area is needed. Where pressure is measured in Pascals, force in newtons and the cross sectional area in square metres. A hydraulic system works by applying a small force to one piston to produce a much larger force to a second piston. For example, if one piston has a cross sectional area of 0.001m^2 and a force of 15N is applied to it, then since the pressure is transmitted equally to the other piston of area 0.01m^2 then the force acting on the second piston is 150N
Hydraulic systems are used in all kinds of things such as car braking systems, car jacks and on the landing gear of some aircraft. All these applications take a small effort force and produce a large load. And it’s a good job too, because I wouldn’t want to change a tyre without hydraulics.
References:
1. http://www.bbc.co.uk/education/subjects/zrkw2hv
2. CGP GCSE Physics AQA Revision Guide.Show More 
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Derby County Show Digger Exhibition - Hydraulics in Action - JCB
This is great little video which shows the power of hydraulics in action. [...]
This is great little video which shows the power of hydraulics in action. Amazing British construction.
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Hydraulics in Action
Simple model to show how hydraulics work
Simple model to show how hydraulics work
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Pressure in Syringe
Super quick video to show how the work done on a liquid is transferred [...]
Super quick video to show how the work done on a liquid is transferred through the liquid to make a change in force or distance moved by a piston. F1D1 = F2D2 what you gain on the force you lose on the distanceShow More 
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This is a quick video walkthrough of an Edexcel exam question. It is [...]
This is a quick video walkthrough of an Edexcel exam question. It is designed so you can look at questions which relate to questions from specific parts of the course.
It is taken from a real paper and I have used a real mark scheme which I have adapted for on-screen use. If you listen carefully it will give you a really good idea of what an examiner is looking for.Show More 
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Q12 4B 4D Energy 5B Pressure June 2018 iGCSE Physics
This is a quick video walkthrough of an Edexcel exam question. It is [...]
This is a quick video walkthrough of an Edexcel exam question. It is designed so you can look at questions which relate to questions from specific parts of the course.
It is taken from a real paper and I have used a real mark scheme which I have adapted for on-screen use. If you listen carefully it will give you a really good idea of what an examiner is looking for.Show More
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