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Solutions ⇒ Class 8th ⇒ Science ⇒ 12. Friction

Solutions 12. Friction - Chapter Review | Class 8 Science - Toppers Study

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12. Friction

| Chapter Review |

Solutions 12. Friction - Chapter Review | Class 8 Science - Toppers Study


Chapter review:

  • Friction opposes the relative motion between two surfaces in contact. It acts on both the surfaces.
  • The force of friction always opposes the applied force.
  • Spring balance is a device used for measuring the force acting on an object.
  • Friction can also produce heat. Vigorously rub your palms together for a few minutes.
  • Friction depends on the nature of surfaces in contact.
  • The substances which reduce friction are called lubricants.
  • When one body rolls over the surface of another body, the resistance to its motion is called the rolling friction.
  • When one body slides over the surface of another body, the resistance to its motion is called the sliding friction.
  • Static friction comes into play when we try to move an object at rest.
  • Rolling friction is smaller than the sliding friction.
  • Sliding friction is smaller than static friction.
  • The frictional force exerted by fluids is also called drag.
  • Friction can be increased by making a surface rough.
  • Friction can be reduced by using lubricants.

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Solutions ⇒ Class 8th ⇒ Science
1. Crop Production And Management
2. Microorganisms : Friend And Foe
3. Synthetic Fibres And Plastics
4. Materials : Metals And Non-Metals
5. Coal And Petroleum
6. Combustion And Flame
7. Conservation of Plants And Animals
8. Cell - Structure and functions
9. Reproduction in animals
10. Reaching the age of adolescence
11. Force And Pressure
12. Friction
13. Sound
14. Chemical Effects of Electric Current
15. Some Natural Phenomena
16. Light
17. Stars And The Solar System
18. Pollution of Air and Water

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