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# Yr10 Density & Pressure

Yr 10 lesson Objectives
by

## DC Physics

on 16 November 2016

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#### Transcript of Yr10 Density & Pressure

One of the weights has a hole in the middle of it. How would you work out which it is?
Describe how to determine density using direct measurements of mass and volume.
The density of water is:
1000kg/m^3 = 1g/cm^3
Density
Measuring density
Pressure
Starter
Recall and use the relationship between density, mass and volume
Starter
What makes something float or sink?
Pressure with depth
Ideal Gases
Recall and use the relationship between pressure, force and area:
STARTER
How does the bear prevent itself from falling though the ice?
Density & Pressure
Why don't you feel the pressure?
Understand that the pressure at a point in a gas or liquid which is at rest acts equally in all directions.

Recall and use the relationship for pressure

pressure = density × g × height
Why are women advised not to wear high heels on expensive wooden floors?
Unit of pressure: Pascals (Pa)
Can you explain the following?
Recall that molecules in a gas have a random motion and that they exert a force and hence a pressure when they collide with the walls of the container.
Understand the significance of Brownian motion.
Gas laws & Temperature
Understand that an increase in temperature results in an increase in the speed of gas molecules.
Describe the Kelvin scale of temperature and be able to convert between the Kelvin and Celsius scales.Units: kelvin (K), degrees Celsius (oC)
Can you explain this effect
Understand that the Kelvin temperature of the gas is proportional to the average kinetic energy of its molecules.
Describe the qualitative relationship between pressure and Kelvin temperature
Boyle's Law
Use the relationship between the pressure and volume of a fixed mass of gas at constant temperature:
Can you explain this effect
Reverse process is a bomb
Density
Pressure
Pressure Law
The crown of Syracuse & Archimedes
Plimsoll Line
Earth Ball
Does water boil at 100 degrees on mount Everest?
Sizewell B Nuclear power station is a pressurised reactor - Why is this?
2 bottles full of water, one with a straw attached to it.
Both inverted, how fast do they drain?
Watch all the lessons here
Why is the balloon under-inflated?
Boyle's Law
You have nine coins identical in every way, except one coin is lighter. You have a weighing scale but nothing else. How do you identify the light coin in only two weighings?

Extension Question
Diving the deepest
How do submarines work
Crushing Can
Veritaseum
Mr Sciguy
http://labs.minutelabs.io/Brownian-Motion/
PhET - Pressure with Depth simulation
https://goo.gl/JfJfP7

Let the Atmosphere do the work
A cold cuppa...?
How does a pressure cooker actually work?

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