ISO 31-3 is the part of international standard ISO 31 that defines names and symbols for quantities and units related to mechanics. It is superseded by ISO 80000-4.
Its definitions include (note boldfaced symbols mean quantity is a vector):
|Force||F||newton||N||1 N = 1 kg·m/s2||Unit named after Isaac Newton|
|Moment of force, Torque||M,||N·m||1 N·m = 1 kg·m2/s2||The unit is dimensionally equivalent to the units of energy, the joule; but the joule should not be used as an alternative for the newton metre.|
|Linear momentum||p||kg·m/s or N·s|
|(Linear) impulse||J||N·s or kg·m/s|
|Angular momentum||L||kg·m2/s or N·m·s|
|Mechanical energy, Work||E, W||joule||J||1 J = 1 kg·m2/s2 = 1 Pa·m3 = 1 W·s||Unit named after James Joule. The joule is dimensionally equivalent to the units of torque and moment of force but should be used in preference to the newton metre (N·m).|
|Power||P||watt||W||1 W = 1 J/s = 1 N·m/s = 1 kg·m2/s3||Unit named after James Watt.|
|Pressure||p||pascal||Pa||1 Pa = 1 N / m2 = 1 kg/(m·s2)||Named after Blaise Pascal.|
|Normal stress, Shear stress||pascal||Pa||1 Pa = 1 N / m2 = 1 kg/(m·s2)||Named after Blaise Pascal.|
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