Force has the dimension length mass per time squared. The SI unit of force is the newton, which is defined as a kilogram meter per second squared.

Maple knows the units of force listed in the following table.

An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively.  Refer to a unit in the Units package by indexing the name or symbol with the context, for example, newton[SI] or lbf[standard]; or, if the context is indicated as the default, by using only the unit name or symbol, for example, newton or lbf.

The units of force are defined as follows.

A gramforce is defined as the force of gravity on a gram, that is, acceleration_of_free_fall*gram.

A pond is another term for the gramforce.

A dyne is defined as a gram centimeter per second squared.

A sthene is defined as a tonne meter per second squared.

An ounceforce is defined as the force of gravity on an avoirdupois ounce, that is, acceleration_of_free_fall*ounce.

A poundforce is defined as the force of gravity on an avoirdupois pound, that is, acceleration_of_free_fall*pound.

A tonforce is defined as the force of gravity on a short ton, that is, acceleration_of_free_fall*ton.

A kip or kipf is defined as $1000$ poundforces.

A poundal is defined as an avoirdupois pound international foot per second squared.

A planck force is defined as a planck length times planck mass per planck time cubed.

$\mathrm{convert}\left('N'\,'\mathrm{dimensions}'\,'\mathrm{base}'=\mathrm{true}\right)$

$\frac{\mathrm{length}\mathrm{mass}}{{\mathrm{time}}^2}$

$\mathrm{convert}\left(1\,'\mathrm{units}'\,'N'\,'\mathrm{kilogramforce}'\right)$

$\frac{20000}{196133}$

$\mathrm{convert}\left(1\,'\mathrm{units}'\,'\mathrm{dyne}'\,'\mathrm{ozf}'\right)$

$\frac{320000000}{8896443230521}$

$\mathrm{convert}\left(2400.\,'\mathrm{units}'\,'\mathrm{kipf}'\,'N'\right)$

$1.067573188\times {10}^7$