Pressure

​ Pressure

​Before We look in details about the pressure,

Let us watch a
Video_1-Click here
video_2- Click here

Multiple Choice

Pressure is a force acting on a unit surface area

• True

• False

• Neither

Multiple Choice

We know that $$P=\frac{F}{A}$$  , so from this equation we can say that pressure increases as area of depth increases.

• True

• False

• Neither

Multiple Choice

Bar is also a unit of pressure.

• True

• False

Open Ended

Why does a lady walking in high heels cause little dimples in a floor than walking with flat heels?

Open Ended

Why should you use an iron hammer instead of a wooden hammer?

​ Liquid/Fluid Pressure

​Before we proceed further about the Liquid/fluid pressure, Let us watch a video, Click here

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Click here to view another video:​

​Characteristics of liquid pressure:​

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1. Increase with depth.

2. Acts in all directions.

3. Does not depend on the area of its surface.

4. Does not depend on the shape or size of the container.

5. The pressure at the two point at the same level in the same liquid is same.

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Note: The liquid pressure does not depend on the size and the shape of the solid

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​Click here to view simulation on liquid pressure

​Transmission of pressure inside a confined liquid

​ ------Pascal's Law------

​Click here to view a video

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The pressure exerted to a confined liquid is transmitted equally and undiminished in all directions throughout the mass of the liquid.

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-The above fact was found out by Blaise Pascal and is known as Pascal's law​

​Application of Pascal's Law

1. Thanks to Pascal’s principle, we can lift huge trucks and cars with only human muscles, pump blood around the body, and stop a bike/cars/huge trucks by just pressing a button. All through the power of fluids.

2. Hence pascal's law plays an important role in the modern world

some of the areas of applications of Pascal's law:

• Hydraulic Machines (excavators, car brakes, cranes, dentist chair,etc...)

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​Common Mechanism in Hydraulic Machines

​Click here for a video about the general mechanism of Hydraulic Machine

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Click here for another video​

​Common Mechanism in Hydraulic Machines

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​With the help of hydraulic machines, heavy weights are lifted or substances are pressed hard, because hydraulic machines act as force multipliers.

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Note: In hydraulic machine a liquid cannot be replaced with gas because:

• Gas is easily compressible and so if a gas is used, the energy would mostly go into compressing a gas.

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​What are the necessary conditions for Pascal's law to be valid?

​Weightings

​Mid Term Examination Weightings - 2022

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​Mid Term Examination Weightings - 2024

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​Electricity and Electric Current 244 6 10
Magnetism