PRESSURE 1

Considered Formula


Example 1
A log exerts weight of 1200 N on the ground at an area of 8 m2. Calculate the pressure exerted by the log to the ground.
Solution


Example 2
A doctor applies a force of 80 N to tip a victim. If the surface area of the needle used in syringe was 0.0002 m2. Calculate the pressure exerted by needle the skin of the victim.
Solution

EXERCISE

  1. A tip of needle has a cross- sectional area of 0.000001m2. If doctor applies a force of 2N to a syringe that is connected to the needle, what is pressure is exerted at the tip of the needle?
  2. A block of wood that weighs 30N and measures 5m by 10m by 4m. If it was placed on a table with the largest possible area 50m2 and the smallest possible area 20m2 in contact with table, Calculate;
    3. i)        Maximum pressure
    ii)       Minimum pressure exerted by the block of wood on the table
  3. A rectangle metal block of cross-section area 1.2 m2 rests on a horizontal surface. If the metal block exerts a force of 1260000 N. Calculate the pressure that the block can exerts on the surface.
  4. A woman weighting 500N wear a pair of shoes with heels of area 250m2, what is the pressure exerted on the floor by a heel of her shoes?
  5. A pressure exerted by bucket containing water to the head of house-girl was 48 N/m2. If the cross-section area of bucket in contact with the house girl’s head was 0.3 m2. Calculate the force exerted by the bucket to the house girl
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