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Question about linear momentum and angular

  1. Nov 22, 2014 #1
    1. The problem statement, all variables and given/known data
    If an analysis of momentum and impulse, a rigid body has initial linear and angular momentum zero, does this mean that the vector sum of the impulses and the vector of LINEAR momentum final, will be in the same direction?

    2. Relevant equations
    Systema moment 1 + System Extern Impulses (1-->2) = Sistem Momenta 2

    3. The attempt at a solution
    I supposed that, because they are vectors, right??
  2. jcsd
  3. Nov 25, 2014 #2


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    Gold Member

    If we let L denote the linear momentum and I the linear impulse (both vector quantities), then
    L2 - L1 = I
    This is a vector equation. If (for your problem) L1 = 0, then this reduces to
    L2 = I
    which says that both vectors must have the same direction.

    Angular momentum is not involved at all here. Why did you mention it in the original question?
  4. Nov 27, 2014 #3
    Ok, thank you!! I was talking about angular momentum becasue it's included in an analysis for solve a problem where a rigid body is in translation and rotation.
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