Using scale drawings to find resultant force

• Why do we use scale drawings to find resultant force?

  We can use parallelograms to calculate resultant forces.
• How do you calculate resultant force using scale drawings?

  You just need to make the rest of the parallelogram. You'll need a compass, a protractor, a ruler and a sharp pencil
• What is an object in if the forces are balanced?

  In equilibrium
• How can you tell an object is in equilibrium on a scale diagram?

  The tip of the last force you draw should end with the tail of the first force you drew. E.g For 3 forces, the scale diagram will form a triangle