Conservation of momentum in perfect elastic collisions

  • #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?
 

Answers and Replies

  • #2
olivermsun
Science Advisor
1,244
118
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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