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Homework Help: Magnitude of Frictional Force in Simple Harmonic Motion

  1. Jun 10, 2017 #1
    1. The problem statement, all variables and given/known data

    I do not fully grasp the concept behind all of these sub questions (i)-(iv).
    2. Relevant equations
    v=wAcos(wt) (SMH)?
    Friction Force = Coefficient of Friction * Normal Force
    3. The attempt at a solution

    (i) Varying as simple harmonic motion sees varying acceleration as it oscillates forwards, until a stationary point and then backwards.

    (ii) Same (not varying) as block A moves with block B, in identical harmonic motion?

    (iii) I think this has to do with the result of (ii), which would indicate (ii)'s correct answer is 'varying' but I am not sure why (conceptually).

    (iv) as (iii)
  2. jcsd
  3. Jun 10, 2017 #2


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    F=ma. If a is varying, what can be said about F?
  4. Jun 10, 2017 #3
    I see, very simple. Thank you!

    So for (iii), block A would be more likely to slip when block B is at x=d because at x=d block B would have greater acceleration (would it?)
    Last edited: Jun 10, 2017
  5. Jun 11, 2017 #4


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