Mec 107 Friction Mcq

Friction 

    1)   Which motion has magnitude of static frictional force directly proportional to normal reaction?

    a. Actual motion
    b. Impending motion 
    c. Both a. and b.
    d. None of the above

    2)   Which formula is used to calculate angle of static friction (Φs)?

    a. tan-1 μs 
    b. sin-1 μs
    c. cos-1 μs
    d. none of the above

    3)   Frictional force depends on ________

    a. surface area in contact
    b. roughness of surface 
    c. both a. and b.
    d. none of the above

    4)   Which belt is used to transmit power at high speeds?

    a. Flat belt
    b. V belt 
    c. Both a. and b.
    d. None of the above

    5)   What is the relation between tight side and slack side for a flat belt?

    a. (Tight side x slack side) = eμβ
    b. (Tight side / slack side) = eμβ
    c. (Tight side + slack side) = eμβ
    d. None of the above

    6)   Which of the following statements is true for flat belts?

    a. They are used for short distances between the pulleys
    b. They have high efficiency
    c. They are used in lathe machines 
    d. All of the above

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