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Thread: p=mv

  1. #1
    Join Date
    Apr 2007
    Posts
    2

    p=mv

    OK, it's only been 31 years since I thought about this stuff. Recently started listening to the podcast. Towards the end of the podcast on Relativity, conservation of momentum was discussed. As an object approaches "c", time slows, and the mass becomes infinite. So if p=mv and v=d/t, therefore p=md/t. It's the t thing I don't understand. As time slows does t get smaller or bigger, shorter or longer?
    Thanks,
    Paul

  2. #2
    Join Date
    Mar 2005
    Posts
    1,425
    t would have to get smaller to conserve p, assuming m grows.

  3. #3
    Join Date
    Apr 2007
    Posts
    2
    Wouldn't the numerator and denominator have to increase or decrease together to keep p constant?
    Paul

  4. #4
    Join Date
    Sep 2003
    Posts
    1,498
    The speed is changing, implying a force. Why would you assume momentum to be constant?

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