1. 20 35 22 Find the angle between the forces shown if they are in equilibrium

2. 20 35 22 A B C 20 35 22

3. 1)Use the cosine rule to find the angles in the triangle Cos C = C = 35.40 20 35 22 A B C Cos B = B = 112.80 A = 31.8

4. 2) Interpret the angles back onto the force diagram C = 35.40 20 35 22 B = 112.80 A = 31.8 20 67.2 180 – 112.8 = 67.2

5. 2) Interpret the angles back onto the force diagram C = 35.40 20 35 22 B = 112.80 A = 31.8 20 22 67.2

6. 2) Interpret the angles back onto the force diagram C = 35.40 20 35 22 B = 112.80 A = 31.8 148.2 180 – 31.8 = 148.2

7. 2) Interpret the angles back onto the force diagram 35 22 148.2 180 – 31.8 = 148.2

8. 2) Interpret the angles back onto the force diagram 20 35 22 148.2 67.2 144.6360 –67.2 – 148.2 = 144.6