# polygon method

## Problem 316 | Equilibrium of Concurrent Force System

**Problem 316**

Determine the values of α and θ so that the forces shown in Fig. P-316 will be in equilibrium.

## Problem 315 | Equilibrium of Concurrent Force System

**Problem 315**

The 300-lb force and the 400-lb force shown in Fig. P-315 are to be held in equilibrium by a third force F acting at an unknown angle θ with the horizontal. Determine the values of F and θ.

## 014 Solving for force with given resultant

**Problem 014**

From Fig. P-014, P is directed at an angle α from x-axis and the 200 N force is acting at a slope of 5 vertical to 12 horizontal.

- Find P and α if the resultant is 500 N to the right along the x-axis.
- Find P and α if the resultant is 500 N upward to the right with a slope of 3 horizontal to 4 vertical.
- Find P and α if the resultant is zero.