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This appendix contains factors for converting between metric units commonly used in biomechanics and their English system equivalents. In each case, a value expressed in a metric unit can be divided by the conversion factor given to yield the approximate equivalent in an English unit, or a value expressed in an English unit can be multiplied by the conversion factor to find the metric unit equivalent. For example, to convert 100 Newtons to pounds, do the following:

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To convert 100 pounds to Newtons, do the following:

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VariableMetric Unit← Multiply By Divide By →English Unit
DistanceCentimeters2.54Inches
Meters0.3048Feet
Kilometers1.609Miles
SpeedMeters/second0.447Miles/hour
MassKilograms14.59Slugs
ForceNewtons4.448Pounds
WorkJoules1.355Foot-pounds
PowerWatts745.63Horsepower
EnergyJoules1.355Foot-pounds
Linear momentumKilogram-meters/second4.448Slug-feet/second
ImpulseNewton-seconds4.448Pound-seconds
Angular momentumKilogram-meters2/second1.355Slug-feet2/second
Moment of inertiaKilogram-meters21.355Slug-feet2
TorqueNewton-meters1.355Foot-pounds

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