1. Not finding help here? Sign up for a free 30min 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!

Newtons does a 40 kg bag of stones weigh

  1. Oct 27, 2003 #1
    how much in newtons does a 40 kg bag of stones weigh? my answer is 302 newtons is that correct?
    Last edited by a moderator: Feb 6, 2013
  2. jcsd
  3. Oct 27, 2003 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Hi espo,

    Just think about Newton's second law,

    F = ma

    If you have a bag of stones with a mass of 40 kg, and that bag of stones is in Earth's gravitational field (and thus has an acceleration of 9.8 m/s), then it must exert a force of 40 * 9.8 newtons on the ground. This force is what we call weight.

    The bag weighs 40 * 9.8 = 392 N. Perhaps you typed 302 accidentally, when you meant to say 392?

    - Warren
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?