Figure shows a brick of weight 2 kgf and dimensions 20 cm x 10 cm × 5 cm placed in three different positions on the ground. Find the pressure exerted by the brick in each case.

Given: Thrust = 2 kgf = 20 N ( 1 kgf ≈ 10 N ) Dimensions = 20 cm × 10 cm × 5 cm Pressure = ? i) Thrust = 20 N Area = 20 cm × 10 cm = 200 × ( 10 - 2 m ) 2 = 200 × 10 - 4 m 2 P r e s s u r e = T h r u s t A r e a = 20 200 × 10 - 4 = 1000 Pa ii) Thrust = 20 N Area = 5 cm × 10 cm = 50 × ( 10 - 2 m ) 2 = 50 × 10 - 4 m 2 p r e s s u r e = T h r u s t A r e a = 20 50 × 10 - 4 = 0 . 4 × 10 4 = 4000 Pa iii) Thrust = 20 N Area = 20 cm × 5 cm = 100 × ( 10 - 2 m ) 2 = 100 × 10 - 4 m 2 P r e s s u r e = T h r u s t A r e a = 20 100 × 10 - 4 = 0 . 2 × 10 4 = 2000 Pa

The force acting on an object perpendicular to the surface is called thrust. It is a vector quantity and its SI Unit of thrust is newton ( N ) . Thrust per unit area is called pressure.

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Important Questions on Thrust and Pressure

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Science>Physics>Thrust and Pressure>Floatation

Two metal pieces when immersed in liquid experience equal upthrust on them, then :

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Science>Physics>Thrust and Pressure>Floatation

The weight of the wooden block is

W

. The apparent weight of the body on floating water is

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Science>Physics>Thrust and Pressure>Floatation

A block of wood having a mass $15 kg$ and dimensions $40 cm \times 30 cm \times 20 cm$ is kept on a table-top, It is made to lie on the table-top in three ways with its sides of dimensions

(a) $40 cm \times 30 cm$

(b) $30 cm \times 20 cm$

The pressure exerted by the wooden block on the table-top will be

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Luggage porters place a round piece of cloth on their head when they have to carry heavy loads. By doing this, the area of contact between the load and head :

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Science>Physics>Thrust and Pressure>Floatation

A metal sphere is dipped in water. If at

0 ° C

4 ° C

the buoyancies in water are

β_{1}

and

β_{2}

respectively, then :

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Science>Physics>Thrust and Pressure>Floatation

A block floats with its fraction

η_{E}

inside water when immersed in a beaker containing water and kept on the earth. The beaker along with the block is shifted to the surface of the moon. If

η_{M}

is the fraction of the block now immersed in water, which of the following relations is correct?

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Science>Physics>Thrust and Pressure>Floatation

Why are the chances of drowning in the Dead Sea very less?

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Science>Physics>Thrust and Pressure>Floatation

Calculate the pressure in pascal exerted by a force of

300 N

acting normally on an area of

30 {cm}^{2}

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Science>Physics>Thrust and Pressure>Floatation

Give reasons: It is easier to swim in the sea than in the river.

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Science>Physics>Thrust and Pressure>Floatation

Name two physical quantities that may alter upthrust.

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Science>Physics>Thrust and Pressure>Floatation

A gum bottle rests on its base. If it is placed upside down, how does the pressure change ?

MEDIUM

Science>Physics>Thrust and Pressure>Floatation

Figure shows a brick of weight

2 kgf

and dimensions

20 cm x 10 cm \times 5 cm

placed in three different positions on the ground. Find the pressure exerted by the brick in each case.
Question Image

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Science>Physics>Thrust and Pressure>Floatation

The base of a container measures

15 cm \times 20 cm

. It is placed on a table-top. If the weight of the container is

60 N

, what is the pressure exerted by the container on the table-top ?

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Science>Physics>Thrust and Pressure>Floatation

State whether upthrust will increase or decrease if the volume of the solid increases.

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Science>Physics>Thrust and Pressure>Floatation

Find the area of a body which experiences a pressure of

50000 Pa

by a thrust of

100 N

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Science>Physics>Thrust and Pressure>Floatation

Give reasons: A body experiences more buoyant force on the earth than on the moon.

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Science>Physics>Thrust and Pressure>Floatation

What is thrust ?

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Science>Physics>Thrust and Pressure>Floatation

A normal force of

200 N

acts on an area of

0.02 m^{2}

. Find the pressure in pascal.

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Science>Physics>Thrust and Pressure>Floatation

A boy weighing

60 kgf

stands on platform of dimensions

2.5 cm x 0.5 cm

. What pressure in pascal does he exert ?

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Science>Physics>Thrust and Pressure>Floatation

Naveen and Paul are friends. Paul wanted to celebrate his birthday at home. He bought balloons filled with hydrogen gas from a balloon man. Naveen helped in decorating Paul's room with balloons and cards. Why balloons filled with hydrogen rise up in the air?

How is flotation used in everyday life?

Important Questions on Thrust and Pressure

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