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- 1. Fill in the Blank
Which type of friction comes into play when a book on cylindrical pencils is moved by pushing?
- 2. Fill in the Blank
Name the device which is attached to heavy luggage (such as a heavy suitcase) to move it easily by pulling.
- 3. Fill in the Blank
Give one example from everyday life where wheels (or rollers) are used to reduce friction.
- 4. Fill in the Blank
Why a bicycle and a motor mechanic use grease between the moving parts of these machines?
- 5. Fill in the Blank
Why are cars, aeroplanes and rockets streamlined?
- 6. Fill in the Blank
What prevents us from slipping every time we take a step forward?
- 7. Fill in the Blank
What are fluids? Name two common fluids.
- 8. Fill in the Blank
Why do gymnasts apply a coarse substance to their hands?
- 9. Fill in the Blank
Why is it difficult to climb up an oily or greasy pole?
- 10. Fill in the Blank
Why do tyres of cars wear out gradually?
- 11. Fill in the Blank
What is static friction?
- 12. Fill in the Blank
What is sliding friction?
- 13. Fill in the Blank
What is rolling friction?
- 14. Multiple Choice
Why is it difficult to walk on a well-polished floor? What is the first statement of this audio clip?
A well-polished floor offers very less resistance.
Therefore, it is difficult to walk properly on a well-polished floor.
- 15. Multiple Choice
Why is it difficult to walk on a smooth and wet floor?
A smooth and wet floor offers very less resistance.
Therefore, it is difficult to walk properly on a smooth and wet floor.
- 16. Multiple Choice
Why is it difficult to walk on a well-polished floor? What is the second statement of this audio clip?
A well-polished floor offers very less resistance.
Therefore, it is difficult to walk properly on a well-polished floor.
- 17. Multiple Choice
Why is it difficult to walk on a well-polished floor? What is the second statement of this audio clip?
A well-polished floor offers very less resistance.
Therefore, it is difficult to walk properly on a well-polished floor.
- 18. Multiple Choice
Can we reduce friction to zero by polishing surfaces or using large amount of lubricants? What is the first statement of this audio clip?
Friction can never be entirely eliminated.
No surface is perfectly smooth.
Some irregularities are always there.
- 19. Multiple Choice
Can we reduce friction to zero by polishing surfaces or using large amount of lubricants? What is the second statement of this audio clip?
Friction can never be entirely eliminated.
No surface is perfectly smooth.
Some irregularities are always there.
- 20. Multiple Choice
Can we reduce friction to zero by polishing surfaces or using large amount of lubricants? What is the third statement of this audio clip?
Friction can never be entirely eliminated.
No surface is perfectly smooth.
Some irregularities are always there.
- 21. Fill in the Blank
Which device is used between the hubs and axles of bicycle wheels to reduce friction?
- 22. Multiple Choice
What happens when you rub your hands vigorously for a few seconds? Why does this happen? What is the first statement of this audio clip?
If we rub our hands together for several seconds, then our hands feel warm.
That warmth is caused by a force called friction.
- 23. Multiple Choice
What happens when you rub your hands vigorously for a few seconds? Why does this happen? What is the second statement of this audio clip?
If we rub our hands together for several seconds, then our hands feel warm.
That warmth is caused by a force called friction.
- 24. Fill in the Blank
Explain why sportsmen use shoes with spikes.
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