Density

Density

Objectives

• Calculate standard form equations

• Plot a graph of Mass vs Volume for ball bearings

• Define and describe material properties

Standard Form EquationsConvert the question into standard form first

Straight-forward

1. 0.1 x 0.1

2. 0.1 x 0.01

3. 0.1 x 0.001

4. 0.2 x 0.0002

5. 0.1 / 0.1

6. 0.1 / 0.01

7. 0.1 / 0.001

8. 0.2 / 0.002

Can you see a pattern emerging?

More Challenging

1. 0.02 x 0.004

2. 0.003 x 0.000000000003

3. 0.000036 / 20

4. 250,000 / 0.00004

5. 0.00001 / 50,000

Standard Form Multiplication

1. Convert the equation into standard form. 0.0001 x 0.001 becomes 1x10-4 x 1x10-3

2. Multiply the initial parts of the standard form i.e. 1x10-4 x 1x10-3 becomes 1 x 1 = 1

3. Add the powers together i.e. -4 + -3 = -7

4. The answer is 1x10-7

Standard Form Division

1. Convert the equation into standard form. 0.0001 x 0.001 becomes 1x10-4 x 1x10-3

2. Divide the initial parts of the standard form i.e. 1x10-4 x 1x10-3 becomes 1 / 1 = 1

3. Subtract the powers from each other i.e. -4 - -3 = -4 + 3 = -1

4. The answer is 1x10-1

Finish Yesterday’s Activity

• Calculate density in SI units (kgm-3)• Plot a graph of densities for at least three ball

bearings, preferably four or five• Calculate the gradient• Write a paragraph explaining how you can

improve accuracy and precision• What’s provided your biggest uncertainty• How can you represent errors on the graph

I will be taking these in for marking.

Defining Material Properties

Using laptops collected from the Biology Prep room, research the following words:

• Stress

• Strain

• Tension

• Compression

• Plastic

• Elastic

Homework

• You are going to work in groups of no more than four

• You will create an A3 poster which will show the following:– Definitions of the words already provided

– A use of the properties in different materials

– Describe why the materials were chosen for that property

– A bibliography of resources used