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

2. Last lesson Calculating density

3. 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.

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

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

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

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

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

9. I’m worried!

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

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

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

13. Spread the force over a greater area

14. Camels

15. Snow shoes Tom

16. Caterpillar tracks

17. House foundations

18. Sharp?

19. I had a dream

20. Death?

21. Drawing pins

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

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

24. 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?

25. 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

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