FRICTION (advantages and disadvantages)
- 2. 20/02/2014 2 Advantages and Disadvantages of Friction
- 3. Explain why friction occurs. List the two types of friction, and give examples of each type. Explain how friction can be both harmful and helpful.
- 4. Is a force that opposes motion between two surfaces that are in contact
- 6. 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.
- 7. Because the hills and valleys of a surface are in contact with the hills and valleys of other surfaces, this produce friction.
- 8. 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.
- 9. 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.
- 10. Roughness of surfaces and Force that objects are being pressed one against the other; or their weights
- 11. Rough surfaces And weight of objects
- 12. the amount of friction depends on how well the surfaces grip each other. Tyres on a road have very high friction (they don't slip), skates on ice have very low friction (they slip easily).
- 13. For a solid object moving through a liquid or gas, the amount of friction depends on the shape and surface area of the object and the viscosity (thickness or thinness) of the liquid.
- 14. Friction enables a car to move on road without skidding It becomes sometimes difficult to drive and control car on wet road. This is because of water present on road reduces friction.
- 15. 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.
- 16. 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.
- 18. Is the friction between two moving surfaces
- 20. It occurs when a force is applied to an object but this object doesn’t move.
- 21. 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.
- 22. 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.
- 23. 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.
- 24. 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
- 25. 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
- 26. 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
- 27. 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.
- 30. Friction is a necessary evil We hate it sometimes but we also need it . It is very useful and but harmful too.
- 31. 20/02/2014 31 Advantages and Disadvantages of Friction
- 32. 20/02/2014 32 Advantages and Disadvantages of Friction