Answer
There are two forces acting on the beam. The force of gravity points straight down. The tension force from the crane's cable points straight up. Because the beam is being lowered at a stead speed, the tension force and the force of gravity have the same magnitude. Note that the rectangle in the free body diagram represents the beam.
Work Step by Step
There are two forces acting on the beam. The force of gravity points straight down. The tension force from the crane's cable points straight up. Because the beam is being lowered at a stead speed, the tension force and the force of gravity have the same magnitude. Note that the rectangle in the free body diagram represents the beam.
