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प्रश्न
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
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उत्तर
When we roll an object on a surface, the friction produced between the object and the surface is called rolling friction. Example: when we pull our large suitcases on wheels, rolling friction comes into play. The wheels reduce friction and cut down a lot of effort required to move the suitcase (Rolling friction is less than sliding friction).
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संबंधित प्रश्न
Fill in the blank.
We use ball bearings to .................. the friction.
Select the correct alternative.
Friction is reduced by
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is
- the static friction
- sliding friction and
- rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
State if the following statement is true or false. Correct the statement if it is false.
If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.
Tick the most appropriate answer
Friction always
Fill in the blank
Rolling friction is ............. than sliding friction.
Answer the following in short.
When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.
A moving body comes to rest due to friction alone.
Rolling friction is slightly greater than sliding friction.
