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Plowing Effect

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Question 23
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.

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Solution

The friction between sand paper and the metal sheet is very large, compared to that between the ordinary paper and the metal sheet. Thus the sand paper is able to remove the outer dull layer from the metal sheet more effectively and makes it more shining.

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Similar questions

Q. Which of the following will produce the maximum friction?
(a) rubbing of sand paper on glazed paper
(b) rubbing of sand paper on glass table top
(c) rubbing of sand paper on aluminium frame
(d) rubbing of sand paper on sand paper

Q. Question 23
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.

Q. Two identical metal sheets, A and B are rubbed with paper and sand paper respectively. Which one of them will shine more?

एक जैसी दो धात्विक पट्टिकाओं A तथा B को क्रमशः कागज तथा रेगमाल से रगड़ा जाता है। इनमें से कौनसी पट्टिका अधिक चमकेगी?

Q1) If static friction between two surface X and Y found to be 20 N than the rolling friction between these two surfaces should most likely be:

a) 25 N

b) 20 N

c) 5 N

d) 50 N

Q2)Which of the following will produce maximum friction?

a) Rubbing of sand paper with glazed paper

b) Rubbing of sand paper with sand paper

c) Rubbin gof sand paper with glass table

d) Rubbin gof sand paper with aluminium frame

Q. What happens when two straws are individually rubbed with separate sheets of paper and are brought near to each other?

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