Density 12 November 2018 Objectives: To compare materials in terms of density. To calculate density from experimental measurements. Homework Revise for.

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Density 12 November 2018 Objectives: To compare materials in terms of density. To calculate density from experimental measurements. Homework Revise for test on Monday

Starter (5 mins) Place a range of objects on the front bench and ask the students to decide the order of weight. The students are not allowed to touch them.

Discuss the findings of the Starter to establish students’ understanding of mass and density supported by section P4.1 of the Student’s Book. Show them two identically sized objects with different densities and ask why they have different masses/weight Answers should include keyword: particles

What can you tell me about these four diagrams?

Density takes into consideration mass and volume If an object has the same volume, but weighs more, it has a different density

Practical Students now measure the densities of some regular and irregular objects

Mass Volume Mass Volume Working out the Density of different materials To work out the density of any particular material, you need two different pieces of information. These are: Mass How much stuff there is in the material (measured in g) Volume How much space the material takes up (measured in cm3) To work out the density of a material, you do the following calculation: Mass Volume

Mass Volume Density = Working out the Density of different materials Measured in g Measured in cm3 Measured in g/cm3 Measured using scales Measured using a ruler Find out the width, the length and the height Multiply these together

Length x Width x Height = Volume Working out the Density of different materials Length x Width x Height = Volume 1cm x 1cm x 1cm = 1cm3 1cm x 5cm x 1cm = 5cm3 1cm x 4cm x 2cm = 8cm3 2cm x 3cm x 2cm = 12cm3

Length x Width x Height = Volume Working out the Density of different materials Length x Width x Height = Volume 7cm 10cm 5cm 10cm x 5cm x 7cm = 350cm3

Copy the equation into your book Mass Density = Volume

How do we work out density? Material Mass (g) Volume (cm3) Density (g/cm3) Brick 2000 1020 Gold bar 193 10 Wood 14 20 Ice Cube 7 8

The volume of a cuboid Volume of a cuboid = a × b × c =abc where a, b and c are the lengths of the sides of the cuboid.

Demonstrate Material Mass (g) Volume (cm3) Density (g/cm3)

Working out Density You will be given a set of different materials. For each one, you will need to work out the density. Record your results in a table like the one below: Material Mass (g) Volume (cm3) Density (g/cm3) Stone Iron Aluminium Wood Polystyrene Use these results to rank the materials in order of most dense to least dense.

I want to find out the density of this rock…..

Working out the volume of an irregular object Stage 1 Stage 2 Stage 3

Density of Water is 1g/cm3 Floating or Sinking? Density of Bone is 1.8g/cm3 Density of Cork is 0.24g/cm3 Density of Cork is 3.01g/cm3 Density of Ice is 0.90g/cm3 Density of wood is 0.77g/cm3 Density of Water is 1g/cm3

Plenary (5 mins) Show two similarly sized objects made (ostensibly) of the same material, but one hollow and the other solid. Explain how the objects look the same, have the same volume, and appear to be made of a similar material, yet have very different masses.