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.

Dear Student,When the marble is rolling on the silk cloth or glass sheet, silk cloth or glass sheet will provide less frictional force to the marble as compared when marble will be rolling on the sand.Sand being rough exert more frictional force as compared to silk or glass sheet.Therefore,The marble will move the shortest distance on the layer of sand.Regards   

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