*Full Lesson* Physics: Pressure in Liquids

This is the fourth lesson in a unit of work on motion and pressure. The lesson is aimed towards KS3 but could be adapted for other levels.

The main focus of the lesson is to introduce pupils to liquid pressure, its causes and effects. Pupils will also look at the effect of depth on liquid pressure and use associated forces to explain floating and sinking.

During this lesson pupils will:

• Use an image of a blobfish at the surface to infer information about the effect of water pressure.
• Recap work from last lesson on pressure in gases and link to pressure in liquids.
• Recap the particle model of a liquid, discuss its motion and how this causes pressure on an object submerged in it.
• Consider the changes in pressure on a fish as it swims deeper.
• Investigate and graph the relationship between depth and pressure experienced.
• Use knowledge of forces to explain why some objects float while others sink.
• Complete some short consolidation tasks to check understanding.

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