1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Reaction force on a leaned beam

  1. Jan 27, 2015 #1
    1. The problem statement, all variables and given/known data
    A beam of 12[kN] is on a smooth floor on one side and on a rough edge on the other.
    The total length of the beam is 10[m].
    What is the reaction on the edge.

    2. Relevant equations
    Moments (torque): F1L1=F2L2

    3. The attempt at a solution
    I drew the forces. the reaction on the floor is vertical and also on the edge since there aren't horizontal forces.
    Moments around point A:
    $$12[kN]\cdot 5\cdot \cos 30^0=R\cdot\frac{4[m]}{\tan 30^0}\rightarrow R=7.5[kN]$$
    In the book it's 6.5, i think it's a mistake
     

    Attached Files:

  2. jcsd
  3. Jan 27, 2015 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    I agree with 7.5kN.

    Edit: looks like they took the horizontal distance for mg but the distance up the slope for the wall's reaction.
    Edit 2: ... are you sure they wanted the total reaction, not just the normal reaction from the wall?
     
  4. Jan 27, 2015 #3
    I am almost sure they want the total reaction.
    I leave this problem since i have another one, a little more problematic
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Reaction force on a leaned beam
Loading...