When was the last time you went for a swim? It is a common experience that when you duck your head under the surface of the...

Physics Narrative 11-14

So, if you hold your head under water you can detect the pressure of the surrounding water with your ears. (Your eardrum acts...

Physics Narrative 11-14

As stated earlier, the pressure in a liquid, such as water, increases with depth. You're also probably aware that this is true...

Physics Narrative 11-14

Have you seen the demonstration where the air is removed from an aluminium can? The open can sits on the bench totally at rest...

Physics Narrative 11-14

Every day on building sites machines move huge amounts of earth that would take several people many days to shift on their own...

Physics Narrative 11-14

The simplest hydraulic system consists of a pair of cylinders with moveable pistons in each and the whole system filled with a...

Physics Narrative 11-14

Notice the similarities between the lever systems to the hydraulic systems. The areas of the pistons and the lengths to the...

Physics Narrative 11-14

Liquids are used as the fluid in hydraulic systems. In liquids the particles are close together and so liquids are virtually...

Physics Narrative 11-14

Now for a thought experiment. Suppose you try moving liquid from the left hand side of the hydraulic system to the right hand...

Physics Narrative 11-14

We can follow the argument about shifting fluid with the help of a few simple equations:

Physics Narrative 11-14

We can use the idea of conservation of energy to show how the forces produced at the pistons are related to the distances...

Physics Narrative 11-14

Here the macroscopic phenomenon of pressure is related to the actions of the particles.

Physics Narrative 11-14