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Chapter 10
 (Part 4)
Forces and Pressure
Quiz Time
O Why does the balloon burst on a single nail
  but not on a bed of nails?
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.
10.3 What is Pressure?
O Pressure is the amount of force
      acting on a unit area .
O   Pressure depends on force and area
Calculation of Pressure
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?
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        .
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
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.

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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.