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Homework Help: Number of linearly independant motions

  1. Mar 1, 2015 #1
    1. The problem statement, all variables and given/known data

    For (b), how many points of linearly independent motion are present in this system?

    2. Relevant equations

    3. The attempt at a solution
    The solution says there is rotation of J1, between K1 and D1, to the right of K2 and finally J3

    But isn't there also rotation for J2?
  2. jcsd
  3. Mar 2, 2015 #2


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    2017 Award

    Staff: Mentor

    I agree, there should be J2. On the other hand, one degree of freedom corresponds to a global motion of the whole system, which might be irrelevant, so you can fix one rotation.
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