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Do now! Can you complete any unfinished calculations from last lesson??

Do now!

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Do now!. Can you complete any unfinished calculations from last lesson??. Last lesson. Calculating density. Density. Remember that density is the mass of one cubic centimetre (or sometime cubic metre) of a substance. - PowerPoint PPT Presentation

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Page 1: Do now!

Do now!

Can you complete any

unfinished calculations from

last lesson??

Page 2: Do now!

Last lesson

Calculating density

Page 3: Do now!

Density

Remember that density is the mass of one cubic centimetre (or sometime cubic metre) of a substance.

So for example, gold has a density of 19.3 g/cm3. His means one cubic centimetre (cm3) of gold has a mass of 19.3 grams.

Page 4: Do now!

Density = mass

volume

Or using the formula triangle;

m

D x V

g/cm3

g

cm3

The formula!

Page 5: Do now!

Density of regular shapes

volume = length x width x height

density = mass/volume

mass using a scale

lengthwidth

height

Page 6: Do now!

Density of liquids

Mass of liquid and cylinder

Mass of cylinder

Mass of liquid

Density = mass/volume

Volume

Page 7: Do now!

Density of irregular shapes (1)

Difference in level gives the volume of the shape

mass

Density = mass/volume

Page 8: Do now!

Density of irregular shapes (2)

Displacement can

volume of object

mass

Density = mass/volume

Page 9: Do now!

I’m worried!

Page 10: Do now!

I’m worried!

Some more density questions. Homework due for 8th September

(Tuesday)

Page 11: Do now!

This lesson

• Recall and use the relationship between pressure, force and area

Page 13: Do now!

Spread the force over a greater area

Page 14: Do now!

Camels

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Snow shoes

Tom

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Caterpillar tracks

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House foundations

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Sharp?

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I had a dream

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Death?

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Drawing pins

Page 22: Do now!

Pressure

Pressure = Force

AreaN/m2 or Pa

N

m2

Page 23: Do now!

Pressure

Pressure = Force

AreaN/m2 or Pa

N

m2

F

AP x

Can you copy this please?

Page 24: Do now!

An example

A woman of weight 600N has a shoe area of 150 cm2 and a man of weight 750 N has a shoe area of 360 cm2. What is the pressure beneath their feet?

Page 25: Do now!

An example

A woman of weight 600N has a shoe area of 150 cm2 and a man of weight 750 N has a shoe area of 360 cm2. What is the pressure beneath their feet?

Angelina pressure = force/area = 600/150 = 4 N/cm2

Brad pressure = force/area = 750/360 = 2.1 N/cm2

Page 26: Do now!

Let’s try some questions!

Page 63, questions 1 to 4.

Can you then write (and answer) 3 questions of

your own?