please help explain

This pre-lab has you derive the sum of the torques equations used in the lab. Completing it is necessary for doing the analysis in the lab. Before working on the pre-lab, read the entire Introduction of the lab write-up, paying special attention to the Example of Torque Analysis. The example already derives the equation to find the net torque for a general Class III lever. This is a little different than the levers used in the lab. The Class I lever is completely different: it is a meterstick on a pivot. The Class I and III levers use a similar rotating bar, but this differs from the example in that the hinge point (fitlcrum) is located inside the bar instead of outside. For this reason, we will derive the torque equations for all three classes of levers. Class I Lever: . Class II Lever: Class Il Lever: Do the following to determine the sum of the torques equation for each class of lever (Class I, II, I1I): I. Draw a neat sketch of the apparatus used in the lab. 2. Draw a modified free-body diagram, where the body (fever) is drawn as a line rather than a dot. Include all three relevant masses and corresponding forces (refer to Figure 3 in lab write-up). 3. On the free-body diagram, label all the forces (F, ), F}) acting on the bar and the distances (/;, b, Ip) from the fulcrum to each mass. 4. On the free-body diagram, counterclockwise is considered the positive direction for any torques acting on the lever. 5. Referring to your diagram, derive the formula for the sum of the torques on the lever. Write your formula in the form }, T = 0. Your final equation should be in terms of the relevant masses and distances from the fulcrum. You will use your derived equations in the lab to verify that the torques in each lever are in equilibrium within experimental uncertainty