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8th Class Science Friction Question Bank Friction HOTS Objective Problems

  • question_answer
    Brahma rolls down a ball from a certain height along an inclined plane. After reaching the bottom of the inclined plane, the ball rolls some distance horizontally along a surface. Brahma uses four different objects as the horizontal surface at the bottom of the inclined plane. The four objects are frosted glass sheet, cardboard sheet, sand paper, and wrinkle-free towel. In each case, he measures the distance travelled by the ball from the bottom of the inclined plane along the horizontal surface. On which surface will the ball move the least distance?

    A)  Sand paper                       

    B)  Cardboard sheet

    C)  Frosted glass sheet       

    D)  Wrinkle-free towel

    Correct Answer: D

    Solution :

      Among the given surfaces, the towel offers the greatest frictional resistance to the rolling of the ball over it. A towel is made up of cotton threads that offer a great amount of resistance, i.e., frictional force, to any motion over their surface. As the ball rolls down and moves on the towel, it stops quickly after travelling the shortest distance. This is because the friction offered by the towel surface to the moving ball is the greatest among the given surfaces. The correct answer is D.


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