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

Units don't match

  1. Apr 29, 2015 #1
    In my Analytical Mechanics textbook it states that the terminal velocity of a spherical object, whilst taking the linear and quadratic terms into consideration, is


    The units don't seem to match here. Is this normal?

    This is not a homework inquiry, it for personal reviewing.
  2. jcsd
  3. Apr 29, 2015 #2


    User Avatar
    Science Advisor

    Why don't they match? I think your c1 and c2 are from the expression Fdrag = c1 * v + c2 * v^2. Then the units of c1 are Mass/Time, and the units of c2 are Mass/Length. With these units, the units of c1/c2 is Length/Time, and the units of mg/c2 are Length^2/Time^2, and everything matches.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Units don't match
  1. Impedence matching (Replies: 1)

  2. Lighting a match (Replies: 1)