=== M-3: Static Forces and Moments === <> ==== Objective ==== * To experimentally check the conditions for equilibrium of a rigid body ==== Equipment ==== * 1 Derrick Assembly w/Brace, Pulley & Stirrup * 1 Derrick Arm * 2 1kg Weight Hangers ==== Procedure ==== * Place a load of about 2kg for ''m2'' * Experimentally determine the force ''m3'' needed to hold the derrick in equilibrium with the top member level. * Since this is an unstable equilibrium, adjust ''m3'' so that the derrick will fall either way when displaced equally from equilibrium. *To find the uncertainty in ''m3'' increase or decrease ''m3'' until you know the smallest force ''m3'' which is definitely too large and the largest which is definitely too small. * Weigh the derrick using the single pan balance and find the horizontal distance between the center of the stirrup and the vertical line through the center of gravity of the derrick. * Use the knife edge mounted in a wall bracket to find the center of gravity * ==== Post-Experiment Question ==== ---- [[M-3-200 | M-3 Equipment]] [[201/207 Experiments]]