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Physics

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Hello, I'm trying to figure out which of the following statements are TRUE.

I suspect that 2, 6, 8 are true...and that there is one more that is true, but not sure which one?
Thanks!

It is impossible to have a collision between two objects in which the center-of-mass of the system is stationary the entire time.


If the magnitude of the momentum of one object is smaller after the collision than it is before the collision, the magnitude of the momentum of the other object must be larger after the collision than it is before the collision.


The vector sum of the momenta of the two objects before the collision equals the vector sum of the momenta of the two objects after the collision.


Momentum and kinetic energy are always conserved.


Momentum and kinetic energy are conserved only when the collision is elastic (when the elasticity equals 1).


The magnitude of the change in momentum for one object in the collision is equal to the magnitude of the change in momentum for the other object in the collision.


The motion of the center-of-mass is completely unaffected by any change in the elasticity of a collision.


Momentum is always conserved, but kinetic energy is conserved only when the collision is elastic.


If the center-of-mass of the system is moving in one direction before the collision it must move in the opposite direction after the collision.

  • Physics -

    It is impossible to have a collision between two objects in which the center-of-mass of the system is stationary the entire time.
    1. false


    If the magnitude of the momentum of one object is smaller after the collision than it is before the collision, the magnitude of the momentum of the other object must be larger after the collision than it is before the collision.
    2. true


    The vector sum of the momenta of the two objects before the collision equals the vector sum of the momenta of the two objects after the collision.
    3. true

    Momentum and kinetic energy are always conserved.
    4. false


    Momentum and kinetic energy are conserved only when the collision is elastic (when the elasticity equals 1).
    5. true

    The magnitude of the change in momentum for one object in the collision is equal to the magnitude of the change in momentum for the other object in the collision.
    6. true

    The motion of the center-of-mass is completely unaffected by any change in the elasticity of a collision.
    7. true


    Momentum is always conserved, but kinetic energy is conserved only when the collision is elastic.
    8. true

    If the center-of-mass of the system is moving in one direction before the collision it must move in the opposite direction after the collision.
    9. false

  • Physics -

    ans above is incorrect, though I don't know what is wrong, just that I got it wrong

  • Physics -

    2 is false

  • Physics -

    It is impossible to have a collision between two objects in which the center-of-mass of the system is stationary the entire time.
    False

    If the magnitude of the momentum of one object is smaller after the collision than it is before the collision, the magnitude of the momentum of the other object must be larger after the collision than it is before the collision.
    False

    The vector sum of the momenta of the two objects before the collision equals the vector sum of the momenta of the two objects after the collision.
    True

    Momentum and kinetic energy are always conserved.
    False

    Momentum and kinetic energy are conserved only when the collision is elastic (when the elasticity equals 1).
    True

    The magnitude of the change in momentum for one object in the collision is equal to the magnitude of the change in momentum for the other object in the collision.
    True

    The motion of the center-of-mass is completely unaffected by any change in the elasticity of a collision.
    True

    Momentum is always conserved, but kinetic energy is conserved only when the collision is elastic.
    True

    If the center-of-mass of the system is moving in one direction before the collision it must move in the opposite direction after the collision.
    False

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