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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
Friction depends on the ______ of surfaces.
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The sliding friction is more than the rolling friction.
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Answer the following in a word or two or in a sentence.
Name the force responsible for opposing the motion between two bodies in contact.
Match the following.
| Column I | Column II | |
| a) | Static friction | viscosity |
| b) | Kinetic friction | least friction |
| c) | Rolling friction | objects are in motion |
| d) | Friction between the liquid layers | objects are sliding |
| e) | Sliding friction | objects are at rest |
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
