Friction

Science Class 8 : Chapter 12

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Quick Revision : Friction

  • Friction: Force that opposes relative motion between surfaces in contact.
  • Static Friction: Friction when object is at rest; greater than sliding friction.
  • Sliding Friction: Friction when object slides over surface.
  • Rolling Friction: Friction when object rolls over surface; much smaller than sliding friction.
  • Factors affecting friction: Nature of surfaces, force pressing surfaces together.
  • Friction as friend: Needed for walking, writing, holding objects, vehicle movement.
  • Friction as foe: Causes wear and tear, produces heat, wastes energy.
  • Increasing friction: Making surfaces rough, using treads, using brake pads.
  • Reducing friction: Using lubricants, ball bearings, streamlining, polishing surfaces.
  • Fluid Friction: Friction in liquids and gases; depends on shape and speed.

Questions

Chapter Summary : Friction

What You Will Learn: This chapter covers different types of friction (static, sliding, rolling), factors affecting friction, advantages and disadvantages of friction, methods to increase or decrease friction, fluid friction, and practical applications in daily life.

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