Q2. To sharpen the blade of the knife against a surface , which of the following objects mentioned below will be most suitable ? Why ? (Stone , glass, plastic block, wooden block) Q3. A boy rolls a ball on a wooden surface. The ball travels a short distance before coming to rest. What must he do to make the ball travel for a longer distance before coming to rest ? Why ?(cloth, sand, talcum powder, carpet)
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Answer: see explanation
Explanation:
Stone will be more suitable because it will exert greater reaction and hence greater friction force which sharpen the blade of a knife easily by rubbing.
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Answer:
Rough surface
Explanation:
Rougher the surface, easier to sharpen the knife. This is because of more friction.
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