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Does V0 affect acceleration under constant Force?

  1. Jun 17, 2017 #1
    1. The problem statement, all variables and given/known data

    A block of mass M = 10 kg is sitting on the table as shwoin Figure above. There is friction between the block and the table, the coefficient of friction is u = 0.1.
    The block has initial velocity V, and a constant forceF is applied to the black as showing Figure above.
    A) For the case of V = 0 and F = 5 N, find acceleration of the block
    B) Constant force is F = 5N, and at time t = 0, the initial velocity is v = 2 m/s, find acceleration of the block.
    C) Constant force is F = 15N, and at time t = 0, the initial velocity is v = 2 m/s find acceleration of the block.

    It asks to find the dependence of velocity and position as functions of time, but I assume i just integrate to find those.

    2. Relevant equations
    ΣF=ma
    Ff=μN

    3. The attempt at a solution
    F0-Ff=10kg(a)
    a=(5N-10N)/10kg; a=0

    So I think the acceleration is 0 in both cases, but I'm uncertain if the initial velocity would have an effect. Assuming I derived a correctly V0 doesn't affect a, but I'm honestly not sure.
     
    Last edited: Jun 17, 2017
  2. jcsd
  3. Jun 17, 2017 #2

    Doc Al

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    Staff: Mentor

    You didn't state the problem, but in any case acceleration only depends on the net force.
     
  4. Jun 17, 2017 #3

    Doc Al

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    Staff: Mentor

    (5 - 10)/10 does not equal zero.
     
  5. Jun 17, 2017 #4
    I know in the first case the force of friction is greater than the applied force so its a is 0.
    How do I find the acceleration of the second case with the V0 of 2?

    Is it just -.5m/s2
     
  6. Jun 17, 2017 #5

    Doc Al

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    Staff: Mentor

    Please state the complete problem!
     
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