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Conservation of momentum in perfect elastic collisions

  1. Jul 14, 2014 #1
    I learned that momentum conservation is vectorial, and now, when i read about perfect elastic collisions, I can't understand why they use a scalar conservation. I tryed to use vectorial coervation to see the diference and it's true: it's needed a scalar conservation. But why?
     
  2. jcsd
  3. Jul 14, 2014 #2

    olivermsun

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    Momentum is a vector and is always conserved, whether the collision is elastic, inelastic, somewhere in-between.
    Energy is a scalar and is conserved only in an elastic collision.
     
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