Question

Activity 4
The total normal force experienced by a surface is thrust.
Thrust per unit area is pressure
Take some powdered lime in a tray Place a brick on it in three different ways as shown in the
figure
vertical
horizontal
with broader side
downward
in which arrangement of the brick does it produce more pressure in powdered lime?
(vertical, horizontal, with broader side downward)
identican
d) The area of contact of the brick with powdered lime when it is placed vertically is 0.02 m2
calculate the pressure exerted by the brick of weight 30 N on the lime powder.​

Answer 1

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Explanation:

a) Vertical

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Answer 2

(a) In vertical position, the brick produces more pressure in powedered lime

(b) The pressure is 1500 Pa

Explanation:

(a) We know that

Pressure = Thrust / Area

Here, thrust is nothing but the normal force due to the weight of the brick

Thus, it is clear that for the same amount of thrust if the area of contact is less the pressure will be more

Since the area of contact of the brick is minimum when the brick is in vertical position

Therefore, the pressure in (a) i.e. when the brick is in vertical position will be maximum

(b) Given area of contact A = 0.02 m²

    Weight of brick W = 30 N

Therefore, thrust F = W = 30 N

Pressure = Thrust/Area of contact

Thus,

Pressure = 30/0.02 N/m²

               = 1500 Pa

Hope this answer is helpful.

Know More:

Q: The area of contact of the brick with powdered lime when it is placed vertically is 0.02 m? calculate the pressure exerted by the brick of weight 30 N on the lime powder.​

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