A force is that which when acting on a body that is free to move accelerates the motion of the body. The SI unit of force is the newton. 1 newton is defined as the force required to accelerate a mass of 1 kilogram by 1 metre per second per second.

1 dyne=1x10-5 N 1 poundal (pdl)=0.138255 N
1 pound-force (lbf)=4.44822 N 1 ton-force9964.02 N
1 kilogram-force (kgf)=9.80665 N 1 kip=1000 lbf
1 sthene (sn)=1000 N
Fundamental Forces
ForceRelative StrengthRange
Strong1short ~10-15m
   Electromagnetic10-2long 1/r2
   Weak10-9short ~10-15m
Gravitational10-39long 1/r2

Concorde (thrust dry)5.6x105N
Concorde (thrust with afterburner)6.76x105N
Boeing 747 (thrust with 4 Rolls-Royce RB211)1.059x106N
Ariane 5 (thrust at launch)1.3x107N
Saturn 5 (thrust at launch)3.402x107N

See also: Centrifugal Force, Compression, Coriolis Force, External Force, Kilogram Force, Newton, Pound Force, SI Units, Sthene, Tension, Weak Force.

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Subjects: Physics