The division of the energy function into two forces has a purely organizational purpose and it takes its origin from the first publications about deformable models [1].
It is found that the gas forces of piston and displacer can be decomposed into two forces, one component acts as motivation force resisting the damping force to output power, the other acts as spring force or inertia force according to the phase angle of pressure wave to displacements of the displacer and piston.
If the friction between teeth is neglected, the normal force acting on the top of tooth can be divided into two forces (F_{text{n}} cos alpha_{text{a}}) and (F_{text{n}} sin alpha_{text{a}}), as shown in Figure 2.
Tidwell and Channon split the company into two forces which attempted to move along the ridge.
A horizontal force pointing northeast can therefore be split into two forces, one pointing north, and one pointing east.
In the summer David split his army into two forces, sending William fitz Duncan to march into Lancashire, where he harried Furness and Craven.
The police department of the Saudi Ministry of the Interior is divided into three forces: the regular police, secret police and the religious police.
There is also the "law of the jungle" situation in which four members would see their districts carved into two, forcing relatively equally matched incumbents to run against each other.
Periodically, strong leaders would organise several tribes into one force, creating an almost unstoppable power.
The RAN is divided into seven Force Element Groups (FEGs): Surface Combatants, Amphibious Warfare Forces and Afloat Support Force, Naval Aviation, Submarine Force, Mine Warfare and Clearance Diving, Patrol Boat Force and the Hydrographic Force.
