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Math Help - Forces and Vectors

  1. #1
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    Forces and Vectors

    Here is the problem that I need help with. I've done this sort of problem before, I just can't remember how to do it any more.

    A Force F1 has a magnitude of 6.5 newtons in the same direction as the vector 3i - 4j - 12k. A second force F2is 13 newtons in the same direction as the vector 7i + 24j + 60k.

    Both forces are applied to a mass of 33.1kg at the same time. Find the acceleration of the mass due to the two forces applied.
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  2. #2
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    Quote Originally Posted by DJ Hobo View Post
    Here is the problem that I need help with. I've done this sort of problem before, I just can't remember how to do it any more.

    A Force F1 has a magnitude of 6.5 newtons in the same direction as the vector 3i - 4j - 12k. A second force F2is 13 newtons in the same direction as the vector 7i + 24j + 60k.

    Both forces are applied to a mass of 33.1kg at the same time. Find the acceleration of the mass due to the two forces applied.
    Apply the following ideas:

    F1 = (6.5) (unit vector in direction of 3i - 4j - 12k)

    F2 = (13) (unit vector in direction of 7i + 24j + 60k).

    Fnet = F1 + F2.

    Fnet = ma.
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  3. #3
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    So... unit vectors aren't necessary?
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  4. #4
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    Quote Originally Posted by DJ Hobo View Post
    So... unit vectors aren't necessary?
    *Ahem*
    Quote Originally Posted by mr fantastic View Post
    Apply the following ideas:

    F1 = (6.5) (unit vector in direction of 3i - 4j - 12k)

    F2 = (13) (unit vector in direction of 7i + 24j + 60k).

    Fnet = F1 + F2.

    Fnet = ma.
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  5. #5
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    Quote Originally Posted by mr fantastic View Post
    *Ahem*
    oh whoops! Ok, sorry for bugging you, and thanks for the help.
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