8th Class Science Friction Question Bank Friction

  • question_answer
    In which of the following cases the friction is helpful (H) and troublesome (T)?
    (a) Lighting a matchstick
    (b) Applying the brakes on a cycle
    (c) Use a towel to open tightly closed lid of a bottle
    (d) Pulling drawer out of a desk
     

    A)
    (a) (b) (c) (d)
    T T H H
     

    B)
    (a) (b) (c) (d)
    H H T T
     

    C)
    (a) (b) (c) (d)
    T T T H
     

    D)
    (a) (b) (c) (d)
    H H H T
     

    Correct Answer: D


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