1. Aim: How do we solve static equilibrium problems?

2. Static Equilibrium
An object is in static equilibrium when it is at rest. What will the net force acting on the object in the x direction have to be? What will the net force acting on the object in the y direction have to be?

3. Tips for Solving Problems involving Static Equilibrium
Draw freebody diagram showing all forces acting on object. Write equation for net force in the y direction. Write equation for net force in the x direction. Solve for unknowns.

4. Ex1-Picture Hanging
A picture weighing 100 N is supported by two wires with tensions T1 and T2. Find each tension.
T1 = 50 N and T2 = 85.0 N

6. Ex2-Stoplight
A traffic light is supported by two wires. Find the tension in each wire. The stoplight has a mass of 30 kg.

8. Ex3- Three wire
The tension in wire A is 70 N. Find the tension in wires B and C.
Find angle ϴ
C = 50 N , theta = 45 degrees, B = 49N