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Tension Equation Question - Algebra Related

  1. Jul 21, 2009 #1
    Just a quick question regarding the following equation for tension of an upward moving object.

    T - mg = ma

    According to my text book (for this question at least), solving for T gives us...

    T = m (g + a)

    Looking back at the initial equation we have an m on both sides of the equal sign. But when bringing - mg to the other side and thus solving for T we then only have one m. Where did the second m go?

  2. jcsd
  3. Jul 21, 2009 #2


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    T = m(a+g) = mg + ma. See. There are two ms .
  4. Jul 21, 2009 #3
    That makes perfect sense! Thank you! :)

    Forgive my ignorance, I've got a lot to brush up on with math and algebra, that is called factoring...right?
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