1. Oh no! YouTube - Man Falls Through Roof 4 times!
YouTube - Dumb Woman Falls Through Ice

2. Spread the force over a greater area

3. Camels

4. Snow shoes

5. Caterpillar tracks

6. House foundations

7. I had a dream

9. Sharp?

10. Drawing pins

11. Pressure N
Pressure = Force
Area
N/m2 or Pa m2

12. Can you copy this please?
Pressure F N
Pressure = Force
Area P A x
Can you copy this please?
N/m2 or Pa m2

13. An example
A woman has a weight of 500N and one of her shoes has an area of 150 cm2. A man of weight 700 N has a shoe area of 360 cm2 (one shoe). What is the pressure beneath their feet?

14. An example
Mrs Rayner has a weight of 500N and one of her shoes has an area of 150 cm2. Mr Rayner has a weight of 700 N has a shoe area of 360 cm2 (one shoe). What is the pressure beneath their feet?
Mrs Rayner’s pressure = Force/area = 500/(2 x 150) = 1.67 N/cm2
Man’s pressure = Force/area = 700/(2 x 360) = 0.97 N/cm2

15. Calculating your own pressure
Remember your weight in Newtons is equal to your mass in kilograms multiplied by 10.

16. Calculating your own pressure
Remember your weight in Newtons is equal to your mass in kilograms multiplied by 10.
Can you do the calculations carefully and neatly on the graph paper to show your pressure (don’t forget you have two feet!) and stick it in your book

17. Pressure under a car

18. Really nice car

20. Pressure under a car Mass = 2000kg Weight = mg = 2000x10 = 20000N
Area = 2 x 100mm x 150 mm + 100mm 250 mm
Pressure = ?

21. Let’s try some questions!