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Thread: Statics

  1. #1
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    Statics

    A uniform beam AB of mass 82.11 kg rests against the smooth vertical wall at A, and the rough horizontal floor at B, as shown in the figure below. The coefficient of static friction between the beam and the horizontal floor is = 0.251.

    Calculate the magnitude of the horizontal force P, in N, such that the end B has impending motion to the left. Give your answer to 3 decimal places. Assume g = 9.81 m/s2.
    Statics-scan0003a.jpg

    I would like to know in this question, what are the different forces involved in the horizontal direction? If friction is included, which direction should i take into account?
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  2. #2
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    Re: Statics

    I'm thinking that P=Nwall and P is actually equal to the frictional force pointing to the right side when there is impending motion to the left. Am i right?
    Last edited by noobpronoobpro; Mar 8th 2017 at 02:27 AM.
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  3. #3
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    Re: Statics

    Yes. "Impending" motion means it has not yet started moving but may do so. The force to the left must be exactly equal to the friction force preventing it from moving.
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