1. Can we have surfaces with zero friction? 2. Which surface have more friction- rough or smooth? Why? 3. Would it be possible to walk easily on wet marble floor?Why? 4. Why is it possible to write on rough black board with chalk? 5. A ball is set rolling on the floor. Will it stop by itself? Why? 6. Why do the soles of shoes wear out? 7. Why do we sprinkle talcum powder on the carrom board? 8. Why does a mechanic use grease between the moving parts of the cycle? 9. Give two examples where rolling friction is utilized. 10. Name the two factors on which the magnitude of friction force depends.
Answers
Answer:
1. No, exactly zero friction isn't possible practically. But we can get very close to it by using having very flat and even surfaces, ball bearings, lubricants etc. Having zero friction means that there is no interaction between the two surfaces in contact, but there is no way we can avoid such interaction completely.
2. Friction is always more on a rough surface compared to a smooth surface. This is because rough surface offers more resistance to the movement of an object over it compared to a smooth surface.
3. Friction. The water on a wet marble floor fills the microscopic irregularities on the surface and hence present lesser frictional force. It is therefore difficult to move on a wet marble floor.
4. The friction between the chalk and the rough surface is what allows the chalk to leave behind the chalk dust that we see. Therefore, it impossible to write on a theoretically smooth blackboard.
5. When you roll a ball on the ground, the electrons in the atoms on the surface of the ground push against the electrons in the atoms on the surface of your ball that is touching the ground. A rolling ball stops because the surface on which it rolls resists its motion.
6. The soles of shoes are worn out due to the effect of friction . the soles of shoes increase the friction between surfaces because it makes the surface of the shoes rough . thus , this is due to the fact that friction causes wear and tear of objects and reduces the life of the object.
7. We sprinkle powder on carrom board to make the surface of the board smooth. This reduces the friction between the surface of the carrom board, the striker and the coins. As a result, the coins and the striker can move easily on the carrom board.
8. In simple Words, Grease helps in movement of machines. Grease smooths movements in parts. friction makes the surface of the moving parts of the cycle irregular. Thus they use grease as a lubricant to equalize the surface.
9. Any ball or wheel has rolling friction when rolled on a surface. Some examples of items that have rolling friction are: ... Soccer ball, basketball, or baseball. Car tires.
10. The magnitude of frictional force depends on the surfaces that are in contact and the force pushing them together. This force is usually related to the weight of the object or objects. Surfaces that appear smooth can be rough at the microscopic level, having many ridges and grooves.
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- YES WE CAN HAVE THE SURFACES WITH 0 FRICTION AND MOST OF THE TIME IF ITS NOT MENTIONED IN QUESTION WE ASSUME THAT THE SURFACE IS SMOOTH
- ROUGH SURFACE HAS MORE FRICTION (WE CONSIDER SMOOTH SURFACES AS ZERO FRICTION )
- YES , BECAUSE MARBLE FLOOR IS ROUGH CAUSES FRICTION AND INDIVIDUAL CAN WALK THROUGH THAT
- BCZ ROUGH BOARD CAUSES FRICTION AND THE PERSON IS ABLE TO WRITE WITH CHALK
- YES , BECAUSE FRICTION OPPOSES RELATIVE MOTION AND THE BALL WILL STOP AFTER COVERING A CERTAIN DISTANCE