The gear which transmits power and motion to the rest of the system. The input gear.

The member of a pair of gears to which motion and power are transmitted by the other gear. The output gear

The capacity to do work; the use of mechanisms is necessary to transfer energy.

If the Input handle can be turned in both directions for at least one full turn, the device has a reversible direction of travel.  If it can only be turned in one direction, it is non-reversible.

A push or pull in a straight line

A toothed wheel that works with others to alter the relation between the speed of an engine and the speed of the driven parts. 

The ratio of the speed of the driving member of a gear train to that of the driven member. 

The ratio of the force that performs the useful work of a machine to the force that is applied to the machine 

the part of a machine which contains two or more pieces arranged so that the motion of one compels the motion of the others.

The results of the operation of any system. 

Meshing is a term used to describe the proper engagement of teeth between two or more gears in a gear train.

Circular movement.

The quantitative relation between two amounts showing the number of times one value contains or is contained within the other. 

The amount of work done in a unit of time.

A combination of two or more gears used to transmit motion between two rotating shafts or between a shaft and a slide. 

Toothlike projections arranged on a wheel rim to engage the links of a chain. 

A push or pull in a circular direction. A twisting force. 

The application of force that moves an object a certain distance. 

The use of mechanisms are necessary to __________energy.