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korosh23

  • one year ago

Physics question:

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  1. korosh23
    • one year ago
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    When do we use m1v1= m2v2 ??? when do we use m1v1 + m2v2= M1V1+ M2V2 --> Conservation of momentum, when momentum is conserved.

  2. korosh23
    • one year ago
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    When do we use those formula?

  3. Michele_Laino
    • one year ago
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    the second formula can be used when we have an interaction between two particles, and the system composed by those two particles is isolated, namely no external forces are acting on each particle, only internal forces

  4. korosh23
    • one year ago
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    ok

  5. Michele_Laino
    • one year ago
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    the first formula, can be used when we have to study a collision between two particles, say particle #1 and particle #2. For example when are considering the bullet fired by a gun. There, the momentum gained by the bullet and the one gained by the gun are opposite with the same direction, and their magnitudes checks this condition: m_g*v_g=m_b*v_b where b stands for bullet, and g stands for gun

  6. Michele_Laino
    • one year ago
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    again neglecting any external force acting on both bullet and gun

  7. korosh23
    • one year ago
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    So we can use formula 1 only when there is collision?

  8. Michele_Laino
    • one year ago
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    more precisely when we have a particular collision, where both particle have the same mass, furthermore, before collision, particle #2 is at the rest. Otherwise, we can use the first formula when we have to study the interaction bullet-gun, for example

  9. korosh23
    • one year ago
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    Oh I got it

  10. korosh23
    • one year ago
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    Formula #1 is when collisions happen and there are two objects. They do not add their mass together Formula #2 when collisions happen and momentum conserved, so masses add together and we have to find the velocities. MV1+MV2= (M1+M2)v

  11. Michele_Laino
    • one year ago
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    if we add mass together, after collision, then that collision is not elastic for example

  12. Michele_Laino
    • one year ago
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    the last formula: MV1+MV2= (M1+M2)v can be used to study, for example an inelastic collision

  13. korosh23
    • one year ago
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    Oh ok. That makes sense, Thank you for your helpful explanations. You are such a good tutor.

  14. Michele_Laino
    • one year ago
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    :)

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