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

Homework Help: Forces question

  1. May 18, 2010 #1
    1. The problem statement, all variables and given/known data
    A person with a mass of 80 kg applies a vertical force to the ground of magnitude
    2000 N, and has a braking force of 1000 N. What is the resultant acceleration of the
    person (magnitude only)?
    Please help, never done physics before. Thanks

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. May 18, 2010 #2
    From Newton's third law we know that if the person applies a force of 2000N on the ground then the ground applies an equal and opposite force on the person. So there is 2000N of force pushing the person up, but what other forces are acting on the person and in which direction do they point? Also, can you think of Newton's famous equation that relates force to acceleration?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook