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!

Force of a shot

  1. Sep 20, 2010 #1
    1. What is the average force exerted by a shot-putter on a 7.0 kilogram shot if the shot is moved through a distance of 2.8 meters and is released with a speed of 13 m/s?

    2. F=ma, x = vo t + 1/2 at^2, v=vo at

    3. I think you get time by using D = vt, but when I use this time and plug it into the distance equation above I get a weird answer. The real answer should be in the ballpark of 200 Newtons.
  2. jcsd
  3. Sep 20, 2010 #2
    ok I'm not sure how much calculus you know but the chain rule allows you to write:
    this means the F =mv*(change in velocity)/(change in position)

    However this gives me about 400 N so I might be forgetting something.
  4. Sep 20, 2010 #3
    Thanks for the response

    But I'm in an introductory physics course; calculus is a bit too much for me.

    I'll play around with the numbers some more.

    The problem seems really easy... I just can't get the right answer.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook