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Question:
wet marble floor, dry marble floor, newspaper and towel
Answer:
Force of friction depends on the nature of surfaces in contact. The rougher the surface, the more is the friction between the surfaces in contact and vice-versa. Roughness present in the given surfaces can be arranged in an ascending order as wet marble floor, dry marble floor, newspaper and towel. Hence, the correct sequence of these surfaces when arranged according to the increase in the force of friction acting on the car isówet marble floor, dry marble floor, newspaper and towel.


More Questions :
  • static, sliding, rolling
  • wet marble floor, dry marble floor, newspaper and towel
  • Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
  • Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
  • Explain why sliding friction is less than static friction.
  • You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?
  • Give examples to show that friction is both a friend and a foe.
  • Explain why objects moving in fluids must have special shapes.
  • Explain why sportsmen use shoes with spikes.

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