- #1
portofino
- 35
- 0
Homework Statement
a beam is loaded and supported as shown, determine the reaction at point A
see attachment --> the small circle in the beam is not a hole, it is supposed to represent the point at which the moment is about
Homework Equations
torque tau = r*F*sin(theta)
The Attempt at a Solution
i do know there is a torque being applied by the 2kN force, such that torque = (4m)(-2kN)sin(90) = -8kN, assuming the positive is upwards
the moment at 2m is given to be 3kN m
i know i did something wrong, because the reaction at A is +2kN (upward), opposite to the applied load at 4m, and the given moment about A, M_A = 11kN m CCW
i can understand the reasoning behind the reaction at A, but how did they calculate the moment about A?
i tried using a free body diagram, but i feel i am missing something and thus not moving in the correct direction with this problem, did i do the FBD correct? see attachment