Chapter 10 - Force and Pressure Part 4
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The document discusses pressure and its calculation. It explains that pressure depends on both force and area, with pressure increasing when area of contact decreases and decreasing when area increases. An example is given where an elephant standing on two feet exerts higher pressure than if it were standing on a larger area. Atmospheric pressure is also mentioned, which is the pressure of air on our bodies due to the weight of surrounding air.
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Chapter 10 - Force and Pressure Part 4
- 1. Chapter 10 (Part 4) Forces and Pressure
- 2. Quiz Time O Why does the balloon burst on a single nail but not on a bed of nails?
- 3. Quiz Time O Why does the balloon burst on a single nail but not on a bed of nails? O The force is spread over a larger area (bed of nails) hence force acting on each unit of area (pressure) is smaller. Therefore the balloon will not burst on a bed of nails.
- 4. 10.3 What is Pressure? O Pressure is the amount of force acting on a unit area . O Pressure depends on force and area
- 6. Example 2 An elephant weighs 40 000 N. The area of each of its foot is 0.1m2. What is the pressure on the ground if the elephant is standing on 2 feet?
- 7. 10.3 What is Pressure? O When area of contact is reduced, the pressure will increase . O When area of contact is increased, the pressure will decrease .
- 8. Example 2 O A brick weighs 30 N. It has dimensions of 8 cm x 10 cm x 20 cm. What is the pressure exerted by the block on the ground when it is (a)laid on its largest face? (b) laid on its smallest face
- 9. Atmospheric Pressure O Air exerts a pressure on our body known as the atmospheric pressure. O This is because the air exerts a force on us as the surrounding air have weight.