CBSE Science Class 8

Friction

Friction - Chapter Wise CBSE Solved Question and Answer Based On NCERT

Points To Remember:

  • Friction is the "evil" of all motion. No matter which direction something moves in, friction pulls it the other way
  • Friction is caused by the irregularities on the two surfaces in contact
  • Friction depends on nature of surfaces in contact
  • Friction depends on how hard the two surfaces press together.
  • Static friction comes into play when we try to move an object at rest
  • Sliding friction comes into play when an object is sliding over another
  • Friction is important for many of our activities like striking of matchstick, fixing of nail in the wall etc.
  • Friction can be increased by making a surface rough
  • Friction can be reduced by using lubricants, in many machines friction is reduced by using ball bearings
  • Sliding friction is smaller than static friction and rolling friction is smaller than sliding friction
  • The sole of the shoes and tyres of vehicles are treated to increase friction



Chapter 12 Friction

 

Friction

Friction - Chapter Wise CBSE Solved Question and Answer Based On NCERT


Friction

Points To Remember | Very Short Q&A | Short Q&A | Long Q&A