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. So for example, gold has a density of 19.3 g/cm 3. His means one cubic centimetre (cm 3 ) of gold has a mass of 19.3 grams.

Density = mass volume Or using the formula triangle; m D x V g/cm 3 g cm 3 The formula!

Density of regular shapes volume = length x width x height density = mass/volume mass using a scale length width height

Density of liquids Mass of liquid and cylinder Mass of cylinder Mass of liquid Density = mass/volume Volume

Density of irregular shapes (1) Difference in level gives the volume of the shape mass Density = mass/volume

Density of irregular shapes (2) Displacement can volume of object mass Density = mass/volume

I’m worried!

Some more density questions. Homework due for 8 th September (Tuesday)

This lesson Recall and use the relationship between pressure, force and area

Oh no! od.cdn.turner.com/cnn/big/bestoftv/2007/ 04/06/roberts.the.shot.cnn.ws.wmv

Spread the force over a greater area

Camels

Snow shoes Tom

Caterpillar tracks

House foundations

Sharp?

I had a dream

Death?

Drawing pins

Pressure Pressure = Force Area N/m 2 or Pa N m2m2

Pressure Pressure = Force Area N/m 2 or Pa N m2m2 F AP x Can you copy this please?

An example A woman of weight 600N has a shoe area of 150 cm 2 and a man of weight 750 N has a shoe area of 360 cm 2. What is the pressure beneath their feet?

An example A woman of weight 600N has a shoe area of 150 cm 2 and a man of weight 750 N has a shoe area of 360 cm 2. 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

Let’s try some questions! Page 63, questions 1 to 4. Can you then write (and answer) 3 questions of your own?