presentation of friction

1. Presented by
Group 3
1.Tirtha Bose (171-33-3912)
2.Mahfuzur Rahman (171-33-3866)
3.Noor Mohammad (171-33-3947)
4.Iqbal Hossain (171-33-3874)
5.Naimur Rahman (171-33-3941)

2. Our Presentation topic :
FRICTION

3. Friction
Friction is a force that occurs when two surfaces oppose
each other.

4. Kinds of friction:
Generally,two types of friction
1.Static friction
2.Kinetic friction
Static friction:
The frictional force present just before motion begins

5. Kinetic friction:
The frictional force present with motion
Sliding friction & Rolling friction also the parts of kinetic friction

6. Advantages of friction:
1.Walking is possible due to friction
2.Sitting on a chair is possible for friction

7. 3.Fixing a nail in wall
4.Supporting a ladder to wall

8. 5.Stops the car from moving
6.Running a machine

9. 7.Writing on board or paper
8.Poduces fire

10. Disadvantages of friction:
1.Loss of energy
2.Reduces the efficiency

11. 3.Produces noise
4.Opposes the motion

12. Methods of reducing friction:
1.Use of lubricants
2.Use of grease
3.By polishing
4.Design modification

13. Thanks to all