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NCERT Solutions for Class 8 Science Chapter 12:Friction

iacst-2022

In this chapter, we will study the topic of friction in great detail. The chapter begins by telling us about friction as a force. Then we learn about the various factors that affect friction. The chapter also tells us about ways to increase and reduce friction. We also study fluid friction and various experiments to observe it.

  • Friction opposes the relative motion between two surfaces in contact.
  • The intensity of friction also depends upon the smoothness of the surfaces.
  • The chapter portrays various experiments to test friction on different surfaces, both rough and smooth.
  • The chapter also tells us why friction is necessary in our lives.
  • We read about an everyday life situation that depends on friction.
  • For example, we would not be able to write with pens and pencils on paper if friction did not exist.
  • We also learn about ways to increase and decrease friction.
  • Lubricants are used to reduce friction.
  • On the other hand, the soles of our shoes and the tyres of our cars are grooved and threaded respectively to increase friction.
  • In many machines, ball bearings are used to reduce friction.
  • The chapter also teaches about static friction, sliding friction, and rolling friction.
  • Sliding friction is smaller than static friction.
  • There is also a type of friction called fluid friction.
  • Gases and liquids are also referred to as fluids.
  • The frictional force exerted by these fluids is also called drag.

 

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Also See    
NCERT Solutions for Class 8 Science Chapter 1:Crop Production and Management NCERT Solutions for Class 8 Science Chapter 2: Microorganisms - Friend and Foe NCERT Solutions for Class 8 Science Chapter 3: Synthetic Fibres and Plastic
NCERT Solutions for Class 8 Science Chapter 4: Materials - Metals and Non-Metals NCERT Solutions for Class 8 Science Chapter 5: Coal and Petroleum NCERT Solutions for Class 8 Science Chapter 6: Combustion and Flame
NCERT Solutions for Class 8 Science Chapter 7: Conservation of Plants and Animals NCERT Solutions for Class 8 Science Chapter 8: Cell – Structure and Functions NCERT Solutions for Class 8 Science Chapter 9: Reproduction in Animals
NCERT Solutions for Class 8 Science Chapter 10: Reaching the Age of Adolescence NCERT Solutions for Class 8 Science Chapter 11: Force and Pressure NCERT Solutions for Class 8 Science Chapter 13: Sound
NCERT Solutions for Class 8 Science Chapter 14: Chemical Effects of Electric Current NCERT Solutions for Class 8 Science Chapter 15: Some Natural Phenomena NCERT Solutions for Class 8 Science Chapter 16: Light
NCERT Solutions for Class 8 Science Chapter 17: Stars and the Solar System NCERT Solutions for Class 8 Science Chapter 18: Pollution of Air and Water  

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