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Friction Test -...

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  • Question 1
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    A right circular cylinder of mass M and radius r is sitting on top of a circular platform of radius R such that the axes of the 2 are exactly aligned.



    The whole arrangement is rotating about the central axis at 2 revolutions/second. Then, the force of friction between the cylinder and the rotating disk is

  • Question 2
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    A recovery truck is moving on the North-South highway from South to North. It is towing a 1500 kg car behind it. In which direction will the force of friction act on the car?

  • Question 3
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    A west-bound tractor trailer, which is carrying an abnormally heavy load M, is about to approach a curve on the road. So, it has started to decelerate from its initial speed of 30 m/s with a magnitude of 2 m/s2. The load M is sitting without slipping on the flatbed trailer as shown. What is the value of the force of friction on the mass M and in which direction does it act?

  • Question 4
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    Which of the following statements is false?

  • Question 5
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    A marble is rolled down an inclined plane onto 4 different surfaces (A, B, C, D) with the number of irregularities per unit area in the decreasing order as A > B > C > D. On which surface will the marble cover the greatest distance?

  • Question 6
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    Consider four different scenarios as shown:



    In which of the following cases will the friction between the mass M and the surface it is in contact with be the greatest if it is tried to be moved?

  • Question 7
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    In which of the following scenarios will the friction between the mass M and the surface it is in contact with be the least if it is tried to be moved?

  • Question 8
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    Friction causes wastage of energy in the form of

  • Question 9
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    Which of the following is an advantage of friction?

  • Question 10
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    Which of the following activities increases friction in the corresponding case?

  • Question 11
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    A force of 50 N is required to make a slider move with uniform speed over the steel rail of a machine. Which of the following cannot be the value of the force required to move the slider with the same speed having oiled the rail?

  • Question 12
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    The efficiency of a gear train is 75%. Which of the following can be its efficiency after greasing it?

  • Question 13
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    When a body rolls over the surface of another body, the resistance offered to its motion is called

  • Question 14
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    Under identical conditions, which of the following is true for a given body?

  • Question 15
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    Under which of the following phases of its flight, will a helicopter experience the maximum drag from air?

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