Types of Friction

hope u guys liked it!!

1. TYPES OF FRICTION DONE BY :- NIRANJANA CLASS:- 8A

2. FRICTION Friction is a contact force. Friction opposes the relative motion between the surfaces. Unit of Friction - Netwon . Friction is caused by the irregularties on the two surfaces in contact. Friction always acts in a direction opposite to the motion. When the roughness of the surface increases friction increases.

3. TYPES OF FRICTON Types of friction are: Static friction Sliding friction Rolling friction Fluid friction

4. STATIC FRICTION 01

5. STATIC FRICTION Static force is the friction applied between a stationary object and the surface on which it is resting.

6. EXAMPLES A table lamp resting on a light table. A box of much weight against the ground, difficult to lift and move. A car park on a hills.

7. SLIDILING FRICTION 02

8. SLIDING FRICTION Sliding friction is friction that acts on objects when they are sliding over a surface. Sliding friction is weaker than static friction.

9. EXAMPLES W hen you write with a pencil on paper A box being slid across the floor A child sliding down through a slide in a park. Rubbing both the hands together to create heat. 02 01 03 04

10. 03 ROLLING FRICTION

11. Rolling friction is friction that acts on object when they are rolling over a surface. Rolling friction is weaker than sliding friciton . ROLLING FRICTION

12. EXAMPLES Pulling a luggage fitted with rollers. Skateboard moving on wheels Kicking a football is a rolling friction. 01 03 02

13. FLUID FRICTION 04

14. FLUID FRICTION When a fluid is in contact with soild object or another fluid object, the force resist the motion between them is called fluid fricition . Gases and liquid are both fluids. Streamlined shape help to reduce fluid fricition .

15. Look carefully at the shape of an aeroplane . Do you find any similarity in its shapes and that of a bird?? Question time ?? A- They have a streamlined shape to decrease drag ( the frictional force exerted by fluids is also called drag).