Test 2 Using the 200mm diameter disk and two of the cords, hangers and weights, obtain an equilibrium position as for Test 1. Ensure that the loads lift the disk clear of the table and avoid attaching the two cords to diametrically opposite holes. Record the angles of the cords on a piece of drawing paper, all as before, and note the force in each. Test 3 Repeat Test 2 but this time using 3 cords, ensuring each hanger has a different weight. Show that the only equilibrium position gives concurrent forces.
Record angles and forces as before.
Test 4 Repeat Test 2 using four cords, ensuring different forces are applied through each cord and obtain an equilibrium position in which the four forces are not concurrent. Record angles and forces as before. In your report, record all of the results and draw a polygon of forces to scale for each test. Note and record any closure error. Analyse each result using X and Y axes, and the components of each force.