Q89 of 100 Page 232

A person has applied some mustard oil on his hands. Which of the following objects will become most difficult for him to hold in his hand?

Mustard oil reduces the friction on his hands. So, Glass tumbler will be most difficult to handle.

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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 travels 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.