The subject Theory of Machines may be defined as that branch of Engineering-science, which deals with the study of relative motion between the various parts of a machine, and forces which act on them. The knowledge of this subject is very essential for an engineer in designing the various parts of a machine.

Topic includes :-

1. Constrained Motions
2. Kinematic Chain
3. Grubler's Criterion
4. Grashof's Criteria
5. Mechanism
6. Instantaneous Center
7. Coriolis Component of Acceleration
8. Frictional Torque in Pivot and Collar
9. Belt Drive
10. Gears and Gears Drive
11. Fly Wheel
12. Governors
13. Cams

Theory of Mechines is important topic for preparation of GATE , IES ,. State level compitation exam of Mechanical Engineering Exam.