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Physics

9th

grade

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Friction

8
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5 questions

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  • 1. Multiple Choice
    5 minutes
    1 pt

    A rubber block weighing 60. newtons is resting on a horizontal surface of dry asphalt. What is magnitude of the minimum force needed to start the rubber block moving across the dry asphalt?
    Remeber

     Ff=μFNFf=\mu FN  

    32 N

    40 N

    51 N

    60 N

  • 2. Multiple Choice
    5 minutes
    1 pt

    An 8.0-newton wooden block slides across a horizontal wooden floor at constant velocity. What is the magnitude of the force of kinetic friction between the block and the floor?

     Ff=μFNFf=\mu FN  

    2.4 N

    3.4 N

    8.0 N

    27 N

  • 3. Multiple Choice
    15 minutes
    1 pt
    Image

    MULTI STEP PROBLEM

    For the diagram above shows a 4.0-kilogram object accelerating at 10. meters per second2 on a rough horizontal surface.



    What is the magnitude of the frictional force Ff acting on the object?

     ΣFx=Fnet\Sigma Fx=Fnet  

    5.0 N

    10. N

    20. N

    40. N

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