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

How the velocity of rain relative to the driver in car increases?

  1. Sep 19, 2014 #1
    How does the velocity of the rain with respect to the car get added up? Velocity of rain with respect to man is given by the (velocity of rain wrt ground - the velocity of car wrt ground). Here it's not being added up!
     
  2. jcsd
  3. Sep 19, 2014 #2

    Orodruin

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    How is what you just described not an addition of velocities?
     
  4. Sep 19, 2014 #3

    A.T.

    User Avatar
    Science Advisor
    Gold Member

    You mean because there is a minus sign? Then write it like this:

    velocity of rain wrt car = velocity of rain wrt ground + the velocity of ground wrt car
     
  5. Sep 19, 2014 #4

    CWatters

    User Avatar
    Science Advisor
    Homework Helper

    No. You need to do vector addition not regular addition.
     
  6. Sep 19, 2014 #5
    I think the "wrt" part is basically saying to only use the horizontal components.
     
  7. Sep 19, 2014 #6

    Orodruin

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    wrt is "with respect to" and has nothing to do with projecting out the horizontal components.
     
  8. Sep 19, 2014 #7

    CWatters

    User Avatar
    Science Advisor
    Homework Helper

    I think we need the OP to come back with more info on the problem.
     
  9. Sep 19, 2014 #8

    A.T.

    User Avatar
    Science Advisor
    Gold Member

    That is of course true and how my post #3 should be interpreted.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: How the velocity of rain relative to the driver in car increases?
  1. Relative velocity (Replies: 9)

  2. Relative Velocities (Replies: 4)

  3. Relative velocity (Replies: 6)

  4. Relative velocity (Replies: 1)

Loading...