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The surfaces of the train wheels and rai...

The surfaces of the train wheels and railway tracks are made smooth ". Why ?

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**Step-by-Step Solution:** 1. **Understanding the Role of Friction:** - Friction is the force that opposes the relative motion between two surfaces in contact. In the context of train wheels and railway tracks, friction is essential for the train to start moving, stop, and change direction. 2. **Smooth Surfaces:** - The surfaces of train wheels and railway tracks are designed to be smooth. This is done to reduce the wear and tear on both the wheels and the tracks. Smooth surfaces minimize the roughness that can lead to increased frictional forces. ...
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ICSE-FRICTION-Short answer question
  1. Explain the laws of kinetic friction.

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  2. Define the coefficient of static friction and kinetic friction.

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  3. What is angle of friction?

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  4. Define angle of repose. Is this angle equal to the angle of friction ?

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  5. In the case of a body sliding down a rough inclined plane show that mu...

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  6. What is rolling friction ? How does it arise ?

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  7. What is the relation connecting rolling friction and the radius of the...

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  8. "Friction is a necessary evil". Why ?

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  9. Name four different methods of reducing friction.

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  10. What are antifriction metals ?

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  11. Name a few methods of increasing friction.

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  12. "A horse has to pull a cart harder during the first few metres of its ...

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  13. "Rosin is rubbed on the violin bow ". Why ?

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  14. Derive an expression for the acceleration of a body sliding down a rou...

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  15. Explain why a high pressure tyre roll more easily than a low pressure ...

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  16. The surfaces of the train wheels and railway tracks are made smooth "....

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  17. A body moving on a surface is brought to rest suddenly. What happens t...

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  18. "In hilly areas, sand is thrown on tracks covered with snow ". Why ?

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  19. "Proper inflation of tyres can save fuel". Explain how ?

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  20. Explain why the shapes of high-speed vehicles are streamlined ?

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