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Mass sliding down an inclined plane (True/False)

  1. Feb 8, 2009 #1
    **Mass sliding down an inclined plane (True/False)

    1. The problem statement, all variables and given/known data

    A block of mass M is sliding down an inclined plane and is accelerating. Which of the following statements are true?
    The acceleration of the block is dependent upon the angle of the inclined plane
    The normal force of the plane is equal to the weight of the block
    The frictional force must be less than the component of Mg down the plane
    If the block's mass were halved, its acceleration would not change
    The surface must have some friction because the block is accelerating

    2. Relevant equations

    F=ma
    Fx=mgsinx
    Fy=mgcosx

    3. The attempt at a solution

    1.True, depending on how high or low the angle is, the acceleration will change accordingly.
    2. False, normal force is perpendicular, weight is straight down.
    3. True, the weight is the hypotenuse of the triangle, which is always the largest.
    4. True, the masses cancel out when you get your formula
    5. True? Not to sure about this one. I say true because otherwise it would be constant velocity? It could be false. It probably is lol.

    Am I right? Wrong?
     
  2. jcsd
  3. Feb 8, 2009 #2

    berkeman

    User Avatar

    Staff: Mentor

    Re: **Mass sliding down an inclined plane (True/False)

    Think all are right, but maybe not the last one. What if there were NO friction for the last question...
     
  4. Feb 8, 2009 #3
    Re: **Mass sliding down an inclined plane (True/False)

    Yup, last one was false. Thanks
     
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