Question

A marble is allowed to roll down an inclined plane from a fixed
height. At the foot of the inclined plane, it moves on a horizontal
surface (a) covered with silk cloth (b) covered with a layer of sand
and (c) covered with a glass sheet. On which surface will the
marble move the longest distance and why?

Answer 1

Answer:

The marble will move shortest on the floor covered with sand. Sand will allow more friction between marble and floor making it hard to move longer.

ANS: (b) COVERED WITH A LAYER OF SAND

Explanation:

On the surface which is covered with sand, the marble will move the shortest distance. Because the sand will offer the greatest friction with the marble among the surface which is covered with silk cloth and the surface which is covered with glass sheet.

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Answer 2

$\huge\sf\underline{\pink{O}\blue{P}\red{T}\purple{I}\orange{O}\green{N}-A}$

• ᴛʜᴇ ᴍᴀʀʙʟᴇ ᴡɪʟʟ ᴍᴏᴠᴇ ʟᴏɴɢᴇsᴛ ᴏɴ ᴛʜᴇ ғʟᴏᴏʀ ᴄᴏᴠᴇʀᴇᴅ ᴡɪᴛʜ sɪʟᴋ ᴄʟᴏᴛʜ. sɪʟᴋY SURFACE ᴡɪʟʟ ɴᴏᴛ ᴀʟʟᴏᴡ ᴍᴏʀᴇ ғʀɪᴄᴛɪᴏɴ ʙᴇᴛᴡᴇᴇɴ ᴍᴀʀʙʟᴇ ᴀɴᴅ ғʟᴏᴏʀ ᴍᴀᴋɪɴɢ ɪᴛ ʜᴀʀᴅ ᴛᴏ ᴍᴏᴠᴇ sʜᴏʀᴛᴇʀ.

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• ᴛʜᴇ ᴍᴀʀʙʟᴇ ᴡɪʟʟ ᴍᴏᴠᴇ sʜᴏʀᴛᴇsᴛ ᴏɴ ᴛʜᴇ ғʟᴏᴏʀ ᴄᴏᴠᴇʀᴇᴅ ᴡɪᴛʜ sᴀɴᴅ. sᴀɴᴅ ᴡɪʟʟ ᴀʟʟᴏᴡ ᴍᴏʀᴇ ғʀɪᴄᴛɪᴏɴ ʙᴇᴛᴡᴇᴇɴ ᴍᴀʀʙʟᴇ ᴀɴᴅ ғʟᴏᴏʀ ᴍᴀᴋɪɴɢ ɪᴛ ʜᴀʀᴅ ᴛᴏ ᴍᴏᴠᴇ ʟᴏɴɢᴇʀ.

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