Types of Friction
Types of Friction
Friction can be divided into following type
Static friction: When we apply a force on a body to make it move and it does not move, the force applied is balanced by the force of friction. Thus, “the force of friction in static (stationary) situation is self adjusting. Such force of is called static friction’
Sliding Friction: The force of friction acting between the two surfaces, when one of them just slides over the other surface with a uniform speed is called sliding friction. Sliding friction is less than the static friction
Rolling Friction: When a body is placed over the other bodies like roller or a wheel and is allowed to move this is called rolling friction. It is same as the sliding friction. So, whenever possible sliding friction can easily be replaced by rolling friction. This can be done by using wheels, roller bearings, ball bearings, etc.
Examples of Rolling Friction:
1. The suitcases and travelling bags are provided with small wheels. These wheels have very small amount of rolling friction which help easy movement of suitcase and travelling bags.
2. Roller skates are having small wheels which offer very small rolling friction and help skater to move fast.
Which of the following is not a type of friction ? | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct ? (a) The force of friction acting between the two surfaces, when one of them just slides over the other surface with a uniform speed is called sliding friction. (b) Static friction is less than the sliding friction . (c) Force applied to a body that is placed over the other bodies like roller or a wheel and is allowed to move this is called rolling friction . | |||
| Right Option : C | |||
| View Explanation | |||
Which type friction offers least resistance ? | |||
| Right Option : B | |||
| View Explanation | |||
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