Force is defined by Newton's Second Law, which states that
the net force on a particle is equal to the time rate of change of its momentum. The
units for momentum are mass x velocity. Hence the units of force are mass x velocity /
time.
The newton is the SI unit of force, and
is equivalent to 1 kg x m / s^2
The Dyne is the CGS unit of
force, and is equivalent to 1 g x cm /s^2
The pound is the
EEU unit of force, and is equivalent to 1 lb x ft / s^2
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