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प्रश्न
Answer the following in detail.
Write the characteristics of the force of friction?
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उत्तर
Characteristics of the force of friction are :
- Friction opposes the direction of motion.
- It depends on the nature of the surface that is in contact. Rough surfaces offer a greater degree of friction as compared to smooth surfaces. More the roughness of a surface, the greater is the friction.
- Friction depends upon the weight of the object – greater is the weight of the object, greater is frictional force it faces.
- Friction is independent of the area of the surface in contact when the weight remains unchanged.
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संबंधित प्रश्न
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
What is the cause of friction?
Define static friction
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.
Tick the most appropriate answer
Friction always
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Fill in the blank.
Rolling friction is ........... than sliding friction.
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Why is a ball bearing used in a cycle hub?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
