1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Inertia in motion - why is momentum called this

  1. Oct 31, 2009 #1
    Inertia in motion - why is momentum referred to as this?

    Also, what forces in nature are conservative does anyone know any examples?
  2. jcsd
  3. Oct 31, 2009 #2
    Referred as what?
    All of them.
  4. Oct 31, 2009 #3
    Why's it referred to as "inertia in motion"
  5. Oct 31, 2009 #4
    Where did you read that?
    The Linear momentum of a particle is defined as p=mv. It is a quantity that remains constant with respect to an inertial reference frame, if no forces act on the particle.
  6. Oct 31, 2009 #5
    It's also called inertia in motion
  7. Oct 31, 2009 #6
    I have never read or heard this anywhere. The only reason I see for somebody using this, is because mass is sometimes called a measure of inertia.If a mass is in motion it has momentum. I think it is an ambiguous and useless way to describe momentum. You should try to understand the usual definition.
  8. Oct 31, 2009 #7


    User Avatar
    Homework Helper

    I've heard of momentum being referred to, metaphorically, as "inertia in motion". I don't think it's accurate, even as a lie-to-children, because it doesn't represent how hard it is to move the object.
  9. Nov 1, 2009 #8
    This sounds like an old usage. Where did you read it?
  10. Nov 1, 2009 #9
    Inertia in motion alright. Inertia in what else? I have once read that "inertia" literally means laziness. Maybe this has got something to do with it.
    Inertia would also be a fantastic name for a female. Wonder why no one has chosen it yet. :D
  11. Nov 1, 2009 #10
    (a) somebody decided to call it that,
    (b) somebody did not like momentum,
    (c) somebody is pulling your leg. (fooling you)

    Let's call it "floogum" from now on...
  12. Nov 4, 2009 #11
    if you look at angular momentum

    angular momentum = moment of inertia x angular velocity

    where moment of inertia is the distribution of mass
  13. Nov 8, 2009 #12


    User Avatar
    Science Advisor
    Homework Helper

    It isn't!! :smile:

    (Unless you can produce a quote …)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Inertia in motion - why is momentum called this
  1. Inertia and Momentum. (Replies: 26)

  2. Inertia and momentum (Replies: 9)

  3. Inertia and momentum (Replies: 6)