Distribution of Pressure

Q.

Explain why, porters place a thick, round piece of cloth on their heads when they have to carry heavy loads.

Q. A $60\text{kg}$ girl wearing high heel shoes balances on a single heel. The heel is circular with a radius 1 cm. What will be the pressure exerted by the heel on the horizontal floor?

Q. A force of 10 N is applied on a body of surface area 5 $m^2$. Calculate the pressure exerted (in Pa) on the body.

1. 2

Q.

Write the name of Two factors on which pressure depends.

Q.

What are the factors on which pressure depends?

Q.

How does the broad feet of camel helps them to walk easily

Q.

Why can't we hammer a nail by its head on the wood

Q.

Why do trucks have 8 rather than 4 tyres

Q.

The force acting on unit area of a surface is called ___________.

Q.

Why do camels or elephants have broad feet?

Q. Why is a sharp needle able to pierce through the skin but a broad and wide substance not ?

Q. It is easier to carry school bags with straps.

1. broad
2. narrow
3. small

Q.

A $50kg$ girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter of $1.0cm$. What is the pressure exerted by the heel on the horizontal floor?

Q. Question 28
Two women are of the same weight. One wears sandals with pointed heels while the other wears sandals with flat soles. Which one would feel more comfortable while walking on a sandy beach? Give reasons for your answer.

Q. What is atmospheric pressure? What causes it?

Q. If area of crossection is doubled and the force remains same, then what will be the magnitude of pressure

Q.

When you drink a soft drink with the help of a straw pipe, what forces the liquid up the straw?

Q. Thrust exerted by an iron cuboid when placed on sand is equal to:

1. the mass of the cuboid.
2. the mass per unit surface area.
3. the weight of the cuboid.
4. the weight per unit surface area.

Q. Which of the following would be least likely to sink into the soft ground?

1. 
2. 
3. 
4. 

Q.

Fill in the blanks

If force increases, pressure ___________________

Q. Who exerts the maximum pressure?

1. Reno (weight = 500 N) standing on one foot covering an area of 50 $c{m}^2$ on ground.
2. Sam (weight = 1000 N) standing on two feet covering an area of 100 $c{m}^2$ on ground.
3. Shervin (weight = 500 N) standing on a pole of negligible weight covering an area of 2 $c{m}^2$ on ground.
4. Reno (weight = 500 N) standing on a weighing machine of negligible weight covering an area of 40 $c{m}^2$ on ground.

Q. Why does the porter place a thick cloth around his head before carrying the heavy load?

1. To decrease pressure on the head.
2. To increase force on the head.
3. To reduce force on the head.
4. To increase pressure on the head.

Q.

Aforce of 1200 newton acts on surface of area 10 cm square, normally what would be the pressure applied on the surface?

Q.

Explain why, wooden (or concrete) sleepers are kept below the railway line.Please provide a diagram with labelling

Q.

Pressure exerted by a body is 8650pa, when it is placed on a wooden plank. If the area of contact is 2500cm sq. Find the weight of the body.

Q. Sam applies a force of 6 N uniformly on the top surface of a book of area 20 cm x 15 cm. Calculate the pressure exerted (in Pa) on the surface of the book due to this force.

1. 400 Pa
2. 800 Pa
3. 600 Pa
4. 200 Pa

Q.

You know that a sharp knife cuts better than a dull knife. Do you know why this is so? Give the reasons for your answer.

Q. Why don't we get crushed even though there exists an atmospheric column of air above our heads?

1. The pressure inside our body is lower than the atmospheric pressure.
2. The pressure inside our body is equal to the atmospheric pressure.
3. Our skin is not sensitive enough to feel it.
4. The pressure inside our body is higher than the atmospheric pressure.

Q.

For a given thrust, pressure is ________ proportional to the area of the surface.

Q.

Explain, why a sharp knife cuts more easily than a blunt knife?