Skill 6
Known deflections at specific locations may be used to
compute forces or moments.

      The deflection at B for the beam on the left can be found by
      summing the deflections at B for cases 1 and 2.

      If the deflection at a point is known, that information can be used
      to determine unknown forces or moments. For example, if there
      is a roller support at B, then v_B = 0. Therefore, the following
      equation can be solved for the roller reaction force P.