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Motion driven by force

  1. Jun 13, 2010 #1
    the motion of a body is always in the direction of the resultant force. Why wouldn't this be a correct statement?

    I thought all the forces on a body were added up and the resultant force was the direction in which the body moved. Am I confusing net force with resultant force? I was under the impression that they meant the same thing..
     
  2. jcsd
  3. Jun 13, 2010 #2

    russ_watters

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    Staff: Mentor

    I'd probably replace the word "motion" with "acceleration" in the first post.
     
  4. Jun 13, 2010 #3
    Hey Russ,
    Thanks for the reply. I just checked out your website, and its really cool!
     
  5. Jun 13, 2010 #4
    They are the same.
    But the statement "the motion of a body is always in the direction of the resultant force" is wrong. In circular motion with constant speed, velocity is perpendicular to net force.
     
  6. Jun 13, 2010 #5
    I didn't think of that until now. I guess circular motion totally proved this statement to be incorrect. Thanks for clarifying this for me hikaru
     
  7. Jun 14, 2010 #6

    russ_watters

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    Staff: Mentor

    If you replace "velocity" with "acceleration" the statement still holds in the case of circular motion.

    Thanks for the compliment on my website.
     
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