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Maximum load force

  1. Jan 3, 2017 #1
    1. The problem statement, all variables and given/known data
    A uniform pine beam, 3.6 m long and 9.5 cm x 14 cm in cross section, rests on two supports near its ends, as shown. The beam’s mass is 25 kg and two vertical roof supports rest on it, each one-third of the way from the ends. What maximum load force FL can each of the roof supports exert without shearing the pine beam at its supports? Use a safety factor of 5.0.
    2. Relevant equations


    3. The attempt at a solution

    Answer sheet:
    F= 1/5 x A x Maximum stress

    I just don't understand the first step. Why did I multiply it by 1/5??? And what does safety factor mean?
     
  2. jcsd
  3. Jan 3, 2017 #2

    David Lewis

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    Gold Member

    Safety factor is how many times stronger the member is than it needs to be.
     
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