Objectives
1. To determine the relationship between pressure, force, and area.
2. To help the student understand the law of levers and the principles of moments for static equilibrium conditions.

Procedure
1. Note the designations on the cylinders as A, B, and C.
2. For each cylinder, open the rod end to the atmosphere and charge the cap end of cylinder to complete extension. Repeat charging until all air is removed.
3. Connect a 0-30 psig pressure gauge to cylinder A and fasten the cap end to the bench structure.
4. Place weight (4.4, 17.6, and 22 lb total) on the rod end and record the pressure for each load. Gently tap the weights and cylinder to eliminate friction.
5. Repeat steps 3 and 4 for cylinders B and C.
6. Compare the measured pressures to the theoretical pressures in table form.
7. Make a third class lever using a 1.5" cylinder, strut, and steel bar with the strut at the end of the steel bar. Connect the cap end port to the pressure gauge.
8. Connect the 17.6 lb weight to the steel bar at the appropriate location to produce a M.A. of 2, 3, and 4 and record the pressure for each.
9. Compare the measured pressures to the theoretical pressures in table form.
10. Fasten the .75" cylinder and one 1.5" cylinder to the bench structure and connect the rod of each to the ends of the steel bar. Connect the cap end of both cylinders to the pressure gauge.
11. Calculate the location where the 17.6 lb weight can be connected without affecting the horizontal bar. Would this location change for other loads?
12. With each cylinder rod at full extension, connect the weight and record the pressure.
13. Compare the measured pressures to the theoretical pressures.