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Nature of Surfaces in Contact

When a pencil...

Question

When a pencil cell is released from a certain point on an inclined wooden board, it travels a distance of 35 cm on floor A before it comes to rest. When the same pencil cell is released from the same point on the same inclined board, it travles a distance of 20 cm on floor B before coming to rest. Which floor, A or B, offers greater friction? Give reason for your answer.

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Solution

Floor B offers greater friction (because it makes the moving pencil cell stop at a lesser distance of 20 cm)

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