# Question about linear momentum and angular

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1. Nov 22, 2014

### Queren Suriano

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. Nov 25, 2014

### OldEngr63

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?

3. Nov 27, 2014

### Queren Suriano

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.