Advantages and Disadvantages of Friction

Advantages of friction: 

  • Friction enables us to walk freely.
  • It helps to support ladder against wall.
  • It becomes possible to transfer one form of energy to another.
  • Objects can be piled up without slipping.
  • Breaks of vehicles work due to friction.

Disadvantages of friction:

  • It always resists the motion, so extra energy is required to overcome it.
  • It causes wear and tear of machines.
  • It decreases the life expectancy of moving parts of vehicles.
Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.

Methods of increasing friction: In many cases, friction is very useful. So, enough friction is required and hence become necessary to increase the friction. Some of the common methods of increasing friction are:

  • Spreading sand in slippery roads.
  • Making rough shoe soles.
  • Making surface of footpath rough.
  • Fitting spikes in sport shoes.

Methods of reducing friction: In many cases, friction is very harmful. So, friction needs to be reduced. Some og the ways of reducing frictions are:

  • Polishing or smoothing the surfaces.
  • By the use of lubricants which increases the smoothness of the surface.
  • Giving streamlines shape to submarines, jets etc
  • By using ball bearing in wheels.

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