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  3. 8th Class
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  5. Friction

8th Class Science Friction Question Bank Friction HOTS Objective Problems

  • question_answer
    The force of friction decreases with ____i___ in interlocking between the surfaces in contact and it increases with ____ii____ in the pressing force between the surfaces. The information in which alternative completes the given statement?

    A)  i-an increase, ii-an increase

    B)  i-a decrease, ii-an increase

    C)  i-an increase, ii-a decrease

    D)  i-a decrease, ii-a decrease

    Correct Answer: B

    Solution :

      Force of friction occurs because of irregularities present on material surfaces. When two surfaces are in contact, interlocking occurs between the surfaces. Greater the interlocking between the surfaces, greater is the force required to overcome the interlocking. Hence, force of friction decreases with a decrease in interlocking between the surfaces. Also, greater the pressing force, greater is the interlocking between the surfaces. Hence, force of friction increases with an increase in the pressing force between the surfaces. The correct answer is B.


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