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06:19 Oct 17, 2019 

The primary force for a reciprocating mass is equivalent to the resultant of the centrifugal forces of two masses rotating at a crank radius and at a speed , one in the forward direction of motion and the other in the reverse direction. Note that the "direct" and "reverse" cranks are equally inclined to the dead centre position.

06:17 Oct 17, 2019 

Reciprocating motion, also called reciprocation, is a repetitive up-and-down or back-and-forth linear motion. It is found in a wide range of mechanisms, including reciprocating engines and pumps. The two opposite motions that comprise a single reciprocation cycle are called strokes.[citation needed]
A crank can be used to convert circular motion into reciprocating motion, or conversely turn reciprocating motion into circular motion.
For example, inside an internal combustion engine (a type of reciprocating engine), the expansion of burning fuel in the cylinders periodically pushes the piston down, which, through the connecting rod, turns the crankshaft.

06:15 Oct 17, 2019 

A reciprocating engine, also often known as a piston engine, is typically a heat engine (although there are also pneumatic and hydraulic reciprocating engines) that uses one or more reciprocating pistons to convert pressure into a rotating motion. This article describes the common features of all types.

17:28 Oct 16, 2019 

Can we break this down? https://study.com/academy/lesson/action-and-reaction-forces-...
....should hold and release the reaction force, resulting from strap tension, in the gearbox...
...should (make it possible/allow to) hold and release the reaction force (found/occurring) in the gearbox as a result of strap tension