Question

step by step points for ppt on friction- a neccsasry evil

Answer 1

Answer:

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.

9. Is Friction good or bad?

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.

Explanation:

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