Conversions can be done either with the "->" conversion operator or with the equivalent "convert" function. The function has three parameters: a quantity, a unit to convert from and a unit to convert to. Likewise the conversion operator uses three values: the quantity and unit to convert from are placed on the left side of the operator while the unit to convert to goes to the right side.
The basic unit of force is the joule. All units of force are expressed in terms of this base unit and so measurements can be converted from any one of the following units to any other.
10 newtons -> dyn = 100,000
convert(10; newton; dyne) = 100,000
10 newtons -> lbf = 2.2480894
convert(10; newton; poundForce) = 2.2480894
10 newtons -> gramForce = 1,019.7162
convert(10; newton; gramForce) = 1,019.7162
10 lbf -> poundal = 321.74049
convert(10; poundforce; poundal) = 321.74049
10 Poundal -> Newton = 1.3825495
convert(10; poundals; newtons) = 1.3825495
10 gf -> ounceForce = 0.3527396
convert(10; pond; ounceForce) = 0.3527396
10 dyn -> gramForce = 0.0101972
convert(10; dynes; gf) = 0.0101972