1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Trebuchet help

  1. Jun 29, 2009 #1
    Trebuchet help!!!

    1. Hi, Im writing a report for a trebuchet project, and trying to find the final velocity of the tennis ball, my teacher told us to just use this :F=m(v^2/r) for initial velocity. so I am really confused right now. I don't know how to find final velocity. Also, which equation do I use for acceleration? A=change in v/ total time; or v^2/t ? /I will just post one set of data.: Range: 7.3m; time :.98s; initial velocity: 5.981m/s.

    Please Help..Its Due Tomorrow..AND Im STUCK on this..=[....
    THANK U !
    Last edited: Jun 29, 2009
  2. jcsd
  3. Jun 30, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi elvalil! Welcome to PF! :wink:

    Yes, your teacher is right, because the initial and final velocities will be the same (if we ignore air resistance), provided the trebuchet is at the same height as the target. :smile:

    (and if it isn't, just use KE + PE = constant :wink:)
  4. Jun 30, 2009 #3
    Re: Trebuchet help!!!

    Thank you!
    haha ..it was due today..
    so I got my grade already...

    but oh well..
    thanks anyways...
    now that I understand it completely.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook