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Friction As a Necessary Evil
Friction
 An opposing force called into plain, when two surfaces in

contact with each other tend to slide relative to one another
is called friction.
Example
Sander on a Piece of Wood = High Degree of Friction
Types of Friction
 Static Friction
 Limiting Friction
 Sliding Friction
 Friction as a necessity

Friction
As A
Necessity

it produces heat and
slows down moving
bodies.
 If there were no

friction, the bodies
will either slip or
not move.
Benefits Of Friction

Striking a matchstick

We are able to drive automobiles

Spiked shoes of cricket
players

Writing on paper
Disadvantages Of Friction

Noise pollution is caused

Forest fires are caused
Friction AS An Evil
 Friction as an evil Friction brings about wear and

tear in moving bodies .
 It produces heat and slows down moving bodies.
 A lot of energy is wasted in overcoming friction.
Is Friction good or bad?
Friction can be a good
 When

we walk we push
backwards
against the ground,
the opposing force
pushes us forwards.

 Without

friction , our feet
would slip and walki
ng would
be impossible.
Friction can be bad
 Soil erosion caused by wind (friction of a fluid).
 Holes in your shoes, jeans. (friction of a solid) high

friction.
 Lack of friction is dangerous too, you may fall if the

floor is very slippy.

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Friction as a necessary evil

  • 1. Friction As a Necessary Evil
  • 2. Friction  An opposing force called into plain, when two surfaces in contact with each other tend to slide relative to one another is called friction.
  • 3. Example Sander on a Piece of Wood = High Degree of Friction
  • 4. Types of Friction  Static Friction  Limiting Friction  Sliding Friction
  • 5.  Friction as a necessity Friction As A Necessity it produces heat and slows down moving bodies.  If there were no friction, the bodies will either slip or not move.
  • 6. Benefits Of Friction Striking a matchstick We are able to drive automobiles Spiked shoes of cricket players Writing on paper
  • 7. Disadvantages Of Friction Noise pollution is caused Forest fires are caused
  • 8. Friction AS An Evil  Friction as an evil Friction brings about wear and tear in moving bodies .  It produces heat and slows down moving bodies.  A lot of energy is wasted in overcoming friction.
  • 10. Friction can be a good  When we walk we push backwards against the ground, the opposing force pushes us forwards.  Without friction , our feet would slip and walki ng would be impossible.
  • 11. Friction can be bad  Soil erosion caused by wind (friction of a fluid).  Holes in your shoes, jeans. (friction of a solid) high friction.  Lack of friction is dangerous too, you may fall if the floor is very slippy.