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 shortest distance. Give the reason for your answer.

Answer:

Because it will exert a greater amount of friction on the marble, it will move the shortest distance on the layer of sand, while the other two surfaces, silk fabric and glass sheet, will exert a lesser friction force. As a result, marble moves the shortest distance over a sand-covered floor because it provides far more friction against its motion.

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