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Newton's First Law

  1. Oct 15, 2014 #1
    For Newton's first law, which one is correct?

    1. All objects that are at rest, stay at rest; all objects that are in motion stay in motion, unless acted upon an unbalanced force.

    Or

    2. All objects that are at rest, stay at rest; all objects that are in motion stay in motion, unless acted upon an outside force.

    Thank you!
     
  2. jcsd
  3. Oct 15, 2014 #2

    phinds

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    What do you think and why? It is not the purpose of this forum to spoon-feed answers. You need to make some effort yourself.
     
  4. Oct 15, 2014 #3
    This is not a homework question!
    I am just confused because some websites say number 1 while others say number 2
     
  5. Oct 15, 2014 #4
    explain the difference between the two statements. What does an "outside force" mean, and what would an "unbalanced force" be?
     
  6. Oct 15, 2014 #5
    I do not know!
     
  7. Oct 16, 2014 #6

    sophiecentaur

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    It is only 'words' that you appear to have a problem with.
    Start from the standpoint that Newton One is probably right (go to a third source, perhaps) and see which of those two alternatives could be 'wrong' or just a strange way of putting it, in your view. Try to reconcile them together rather than looking for a wrong one.
     
  8. Oct 17, 2014 #7

    bobie

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    The two sentences are identical but for an adjective, unbalanced is not appropriate, according to Newtons original formulation outside/ external is more appropriate:
     
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