1. Are there any Future doctors, Future engineers, Environmentalists who are upset about or observe the pressures man is putting on the environment Present or future designers, Persons who are on their feet more than 2 hours a day Persons who are feeling the pressures of the exams?

3. When a force is exerted on an object, pressure is also exerted on the object, but force and pressure are not the same thing. Force tells you how an object will accelerate. Pressure tells you how it will feel. or: Force accelerates. Pressure cuts…how much force is over that surface area

4. versus

5. In your groups Let’s try this activity now: Using the pin, (while a paper is held by two persons just in contact with the pin head) place a 50 g mass on the paper Make your observation Now add another 50g mass Make your observation (use a marker to show how deep it went) Answer the questions on the activity sheet please

6. Why does a sharp knife cut better than a dull knife? The diagram at right shows a sharp knife and a dull knife in contact with a surface (maybe a nice, big piece of chicken). You know that the sharp knife cuts more efficiently - Why?

7. Notice that the sharp knife has a very small area of contact with the surface, while the dull knife has a much larger area of contact. If both knives are pushed down with the same force, the sharp knife will exert a much greater pressure on the surface than the dull knife - and pressure cuts. So, if you are "stuck" with a dull knife, you have to exert much more force in order to generate enough pressure to cut your chicken, right?

9. Pressure depends on the amount of force and the area over which the force is applied. More force - more pressure. More area - less pressure. Pressure is directly proportional to force, and inversely proportional to area.

10. So… Pressure (P) is defined as the average force (F) exerted normally per unit area (A) i.e. P = F/A It is a scalar quantity (it has only magnitude) Its unit is called the Pascal, Pa

12. It’s not just pressure for exams or home work deadlines

13. Engineering: distribution of pressure in architectural design

14. Or in pressure inside air engines

15. Or for road surfacing : if you are the engineer or purchaser since rollers are based on The levelling/flattening action is achieved through a combination of the size and weight of the vehicle and the rolls: the smooth wheels and the large cylinder or drum fitted in place of treaded road wheels.

16. Medical Physics: Blood pressure (BP) which is he pressure exerted by circulating blood on the walls of blood vessels, and is one of the principal vital signs.pressurebloodblood vesselsvital signs

17. Transfer of pressure using a syringe

18. Any person carrying a bag

19. Who didn’t understand that the force exerted over a smaller surface area = greater pressure

20. Or anyone on their feet

22. Has pressure distribution

23. Foot and tendon problems High-heeled shoes slant the foot forward and down while bending the toes up. The more that the feet are forced into this position, the more it may cause the Achilles tendon to shorten. This may cause problems when the wearer chooses lower heels or flat-soled shoes. When the foot slants forward, a much greater weight is transferred to the ball of the foot and the toes, increasing the likelihood of damage to the underlying soft tissue which supports the foot.

24. How then can the pressures of society, political and economically be alleviated (made less)? Or How can man reduce the pressure on the environment or how can you reduce your pressure during exam?

25. Do you think you’ll be brave enough to try a bed of nails

26. For home work: Identify on your way home five (5) examples of where you have observed applications of pressure.

27. Try this Force / NSurface area/ m2Pressure 100.1? ?280 20