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# Friction

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### Transcript of "Friction"

1. 1. Made by :- Arpit Lekurwale
2. 2. 20/02/2014 2 Advantages and Disadvantages of Friction
3. 3.  What is friction ?  Advantages of Friction  Disadvantages of friction 20/02/2014 3 Advantages and Disadvantages of Friction
4. 4. Friction (frictional force) is a force that acts in a opposite direction to movement. The force which always opposes the motion of one object over another, object in contact with it , is called friction. 20/02/2014 4 Advantages and Disadvantages of Friction
5. 5. 20/02/2014 5 Advantages and Disadvantages of Friction
6. 6.  It is because of the friction between the sole of the shoe and ground prevents us from slipping.  While walking , we push the ground backwards and the force of friction acts in the opposite direction (i.e. in the forward direction) and prevents us from slipping. By making the balance. 20/02/2014 6 Advantages and Disadvantages of Friction
7. 7. 20/02/2014 7 Advantages and Disadvantages of Friction
8. 8.  Walking on slippery ground is difficult because friction on slippery ground is less due to which we may slip. 20/02/2014 8 Advantages and Disadvantages of Friction
9. 9.  It is because of the friction between the tyres of car and the road which enables car to move forward without skidding.  If there were no friction , car would stay where it was. 20/02/2014 9 Advantages and Disadvantages of Friction
10. 10. 20/02/2014 10 Advantages and Disadvantages of Friction
11. 11.  It becomes sometimes difficult to drive and control car on wet road.  This is because of water present on road reduces friction. 20/02/2014 11 Advantages and Disadvantages of Friction
12. 12.  It is because of the friction between the tip of the pencil ( or pen) and paper.  Carbon particles from the pencil lead rubs off from it, due to the friction, which appears as black marks on the paper. 20/02/2014 12 Advantages and Disadvantages of Friction
13. 13.  We can hold a glass tumbler in our hands because of friction between the tumbler and our hands.  Similarly, we can pick up the books laying on the desk by our hands. 20/02/2014 13 Advantages and Disadvantages of Friction
14. 14.  Friction also produces heat.  We rub matchstick against the rough side of a matchbox, then friction between both of them produces heat and this heat burns chemicals present at the head of matchstick and it lights up. 20/02/2014 14 Advantages and Disadvantages of Friction
15. 15. 20/02/2014 15 Advantages and Disadvantages of Friction
16. 16.  When we walk on the road, tiny surfaces of the shoe keep on breaking off slowly due to which the soles of our shoes wear out slowly  Due to which shoes get damaged and becomes unfit to wear. 20/02/2014 16 Advantages and Disadvantages of Friction
17. 17. After Before20/02/2014 17 Advantages and Disadvantages of Friction
18. 18.  Like the shoe tiny particles of tyres also breakdown due to friction when they run on road.  The same thing also happens with the bicycles 20/02/2014 18 Advantages and Disadvantages of Friction
19. 19. Before After20/02/2014 19 Advantages and Disadvantages of Friction
20. 20.  Brake pad is made of rubber  When the brakes of the vehicles are applied a lot of friction is produced  Friction wears out the brake pads gradually Before - After 20/02/2014 20 Advantages and Disadvantages of Friction
21. 21.  The friction between the soles of the shoes and wear away hard stone steps slowly.  Such type of staircase are usually seen at :  Railway station  Offices  Old Buildings 20/02/2014 21 Advantages and Disadvantages of Friction
22. 22. 20/02/2014 22 Advantages and Disadvantages of Friction
23. 23.  Friction reduces the motion of moving parts of a machine . In fact all the moving things such as (cars , buses, airplanes, boats, ships ,etc.) are slowed down by friction. 20/02/2014 23 Advantages and Disadvantages of Friction
24. 24. 20/02/2014 24 Advantages and Disadvantages of Friction
25. 25. 20/02/2014 25 Advantages and Disadvantages of Friction
26. 26.  Friction is a necessary evil  We hate it sometimes but we also need it .  It is very useful and but harmful too. 20/02/2014 26 Advantages and Disadvantages of Friction
27. 27. 20/02/2014 27 Advantages and Disadvantages of Friction
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