Class 11 Physics — Chapter 2: MECHANICAL PROPERTIES OF FLUIDS

What you'll learn

• ▸Pressure in Fluids
• ▸Density and Relative Density
• ▸Pascal's Law
• ▸Variation of Pressure with Depth
• ▸Streamline Flow
• ▸Bernoulli's Principle
• ▸Viscosity
• ▸Surface Tension

Chapter Summary

--- PAGE 1 --- CHAPTER NINE MECHANICAL PROPERTIES OF FLUIDS 9.1 Introduction 9.2 Pressure 9.3 Streamline flow 9.4 Bernoulli's principle 9.5 Viscosity 9.6 Surface tension Summary Points to ponder Exercises Additional exercises Appendix 9.1 INTRODUCTION In this chapter, we shall study some common physical properties of liquids and gases. Liquids and gases can flow and are therefore, called fluids. It is this property that distinguishes liquids and gases from solids in a basic way. Fluids are everywhere around us. Earth has an envelop of air and two-thirds of its surface is covered with water. Water is not only necessary for our existence; every mammalian body constitute mostly of water. All the processes occurring in living beings including plants are mediated by fluids. Thus understanding the behaviour and properties of fluids is important. How are fluids different from solids? What is common in liquids and gases? Unlike a solid, a fluid has…

Practice Questions from this Chapter

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1. Explain how submarines dive and surface. Get Solution →
2. Describe real-world examples of fluid pressure. Get Solution →
3. How do hot air balloons defy gravity? Get Solution →
4. What are liquids and gases collectively called due to their ability to flow? Get Solution →
5. What is the SI unit of pressure, named in honour of a French scientist? Get Solution →
6. What is the correct formula for the density (ρ) of a fluid with mass (m) and volume (V)? Get Solution →
7. According to Pascal's law, the pressure in a fluid at rest is the same at all points if they are at what? Get Solution →
8. What is the term for the excess of pressure (P – P_a) at a certain depth 'h' below the surface of a liquid? Get Solution →

Did you know?

• 💡 The air pressure on your body equals the weight of a small car.
• 💡 Deep-sea fish do not get crushed because their internal fluid pressure is immense.
• 💡 In the vacuum of space, liquids can boil and freeze at the very same time.
• 💡 Diamonds are formed under pressures more than 50,000 times atmospheric pressure.
• 💡 Water strider insects walk on water because of its strong surface tension.

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