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(physics)Elastic collisions- why does a heavier ball not rebound? Watch

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    So why does a heavier ball not rebound when it collides with a stationary ball which has a smaller mass- in terms of momentum and kinetic energy?
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    So from conservation of momentum we can say:

     m_1 u_1 = m_1 v_1 + m_2 v_2
    Where  m_1 > m_2

    So we need to see why  v_1 > 0

    Rearrange equation for  v_1

    And we see that  v_1 > 0 only if  u_1 > v_2

    Using conservation of energy:

     m_1 u_1^2 = m_1 v_1^2 + m_2 v_2^2

    Rearrange for  u_1^2 . From this we can see that :
     u_1 > v_2 if v1 does not = 0. But that only happens when masses are equal but  m_1 > m_2

    Hopefully this is a good explanation
 
 
 
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