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Elastic collision between 2 different masses

  1. Nov 11, 2015 #1
    1. The problem statement, all variables and given/known data
    See picture

    2. Relevant equations
    p = p1 +p2
    p = mv

    3. The attempt at a solution
    See picture, using equations for the velocity and using 90-tan-1(2) for the angle
     

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  2. jcsd
  3. Nov 12, 2015 #2

    ehild

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    Do not forget that momentum is a vector quantity. Both of its components are conserved.
    Why do you think that θ2=90-tan-1(2)?
     
  4. Nov 12, 2015 #3

    Does this mean that I need to use a px and a py equation? Does what I got help me at all? The picture shows tan(theta1)=2, so theta1= tan-1(2) and since the angle between the two should be 90, 90-theta1 =theta2

    Thanks
     
  5. Nov 12, 2015 #4

    SammyS

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    What makes you think the angle between their directions is 90° ?

    q-png.91722.png
     
  6. Nov 12, 2015 #5

    ehild

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    Yes, you need an equation for px and an other one for py. NO, the two angles do not add up to 90°. It happens if the two masses are equal.
     
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