Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Easy Physics P=mv momentum (please answer)

  1. Jan 23, 2010 #1

    P = MV is the equation for momentum...in order to get the mass a rearrange the equation

    such that it looks like this: M = P/V now as an example lets suppose P = 10 and V = 10

    So..for example I get M = 10/10
    M = 1kg

    Questions: What are the 'terms' for momentum and velocity in this equation?

    Lets suppose for argument sake that I double the momentum so P = 20 & V =10.

    I then come to a conclusion that I do not believe is accurate that if I increase the momentum of an object but not its velocity at the same time I have a decrease in mass ..in this case of 1/2 kilogram? Is that accurate?

    Am I correct in assuming that if there is an increase in momentum there is a direct and corresponding increase in velocity?

    Is it accurate to conlude that no matter what the increase in momentum there is NO increase in mass?
    Thanks for any and all answers
  2. jcsd
  3. Jan 23, 2010 #2


    User Avatar
    Homework Helper

    But you have an increase in mass, m=20/10=2kg. Which is what you would expect.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook