science - friction

Class 8 - Science

Friction

Q&A
Notes
Question:
Explain why sportsmen use shoes with spikes.
Answer:

Sportsmen use shoes with spikes because these shoes give them a better grip while running. This is because the force of friction between the shoes and the ground increases with the help of spikes.

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Questions and Answers


Friction - Questions
1. static, sliding, rolling
Answer
2. wet marble floor, dry marble floor, newspaper and towel
Answer
3. 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.
Answer
4. Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Answer
5. Explain why sliding friction is less than static friction.
Answer
6. You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?
Answer
7. Give examples to show that friction is both a friend and a foe.
Answer
8. Explain why objects moving in fluids must have special shapes.
Answer
9. Explain why sportsmen use shoes with spikes.
Answer
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