# clockwise couple

## 253-254 Equivalent single force to replace a force and a couple

**Problem 253**

In Fig. P-253 a system of forces reduces to downward vertical force 400 lb through A plus a counterclockwise couple of 800 lb·ft. Determine the single force that will produce an equivalent effect.

## 252 Equivalent single force for a force and a couple

**Problem 252**

A force system consists of a clockwise couple of 480 N·m plus a 240 N force directed up to the right through the origin of X and Y axes at θ_{x} = 30°. Replace the given system by an equivalent single force and compute the intercepts its line of action with the X and Y axes.

## 250 Reaction at the supports of cantilever truss

**Problem 250**

The cantilever truss shown in Fig. P-250 carries a vertical load of 10.8 kN. The truss is supported by bearing at A and B which exert the forces A_{v}, A_{h}, and B_{h}. The four forces shown constitute two couples which must have opposite moment effects to prevent movement of the truss. Determine the magnitude of the supporting forces.