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  1. #1
    Hardrocker
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    Physics Help Please?

    A cubical block vibrates horizontally, in Simple Harmonic motion (SHM) with an amplitude of 8.0 cm and a frequency of 1.5 Hz. If a smaller block sitting on it is not to slide, what is the minimum value that the coefficient of static friction between the two blocks can be.

    Answer : 0.72

    Can anyone help?

  2. #2
    '05 NUEser EJ123's Avatar
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    Message Phantomcow2. He'll know.

  3. #3
    another cat...FAB! stevesurf's Avatar
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    In Coulomb Damping, the frictional force each of the object's experience are opposite each other and equal. The Coefficient of static friction of the smaller object x the Normal Force (smaller object's weight) = the Frictional Force.

    Find the equation that relates Force, Amplitude and Frequency of the larger object and solve for the Coeff. of Static Friction.

  4. #4
    Burning Matches. ElJamoquio's Avatar
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    1. Figure out the acceleration with simple harmonic motion.

    x = sin(wt)

    Take the double derivative and find the mzximum. Hint, it should be really easy.


    2. Figure out the force.

    F = m*a = coefficient of friction * m
    Reacting is mind candy; it requires no thought. Thinking is tedious.

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  5. #5
    Hardrocker
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    thanks for the help all. I've solved it. Here's the solution in case you were curious.


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