# static equilibrium

## 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.

## Problem 314 | Equilibrium of Concurrent Force System

**Problem 314**

The five forces shown in Fig. P-314 are in equilibrium. Compute the values of P and F.

## Problem 313 | Equilibrium of Concurrent Force System

**Problem 313**

Figure P-313 represents the concurrent force system acting at a joint of a bridge truss. Determine the value of P and E to maintain equilibrium of the forces.

## Problem 312 | Equilibrium of Concurrent Force System

**Problem 312**

Determine the magnitude of P and F necessary to keep the concurrent force system in Fig. P-312 in equilibrium.

## Equilibrium of Concurrent Force System

In static, a body is said to be in equilibrium when the force system acting upon it has a zero resultant.

### Conditions of Static Equilibrium of Concurrent Forces

The sum of all forces in the x-direction or horizontal is zero.

The sum of all forces in the y-direction or vertical is zero.

**Important Points for Equilibrium Forces**

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