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

A push or pull in a straight line

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

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

Something added to a system, such as resources, in order to achieve a result.

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

A back and forth movement in a straight line

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

The input handle can be turned in both directions for at least one full turn

The results of the operation of any system

The application of force that moves an object a certain distance

Opposite in position, direction, order or effect.

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

A swing back and forth in an arc at a regular rate

Circular movement

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

If you can make the input shaft turn by turning the output shaft the flow of power is reversible. If the input shaft does not turn or only turns part of the way, the power is non reversible.

A gear between the driver and the driven gear used to change the rational directions.