1. Physics

2. The Pulley

3. The Wheel and Axle

4. The Inclined Plane

5. The Screw Jack

6. The Hydraulic Press

7. Sample Exercises
It takes a force of 85 lbs to raise a body that weighs 239 lbs. What is the actual mechanical advantage of the machine that was used?
A load is raised at a distance of 5.7 feet by a force acting through a distance of 17.9 ft. What is the ideal mechanical advantage of the machine that was needed?

8. Sample Exercises
3. A pulley system has four strands supporting the load. A force of 55 lbs is needed to raise a load of 200 lbs. What is the efficiency of this pulley system? 4. An inclined plane has an angle of inclination of 28 degrees. The machine is 68% efficient. What load can be raised by a force of 70 lbs?

9. Sample Problems
Solution:

10. Sample Problems On the General Theory of Machines
A worker is able to raise a body weighing 300 lbs by applying a force of 75 lbs. What is the AMA of the machine that he is using?