Page 13 - Thomson, William Tyrrell-Theory of Vibration with Applications-Taylor _ Francis (2010)

QUANTITY ENGLISH SYSTEM S.I. SYSTEM

force 1 lb 4.448 Newtons (N)
mass 1 lb • sec^/ft (slug) 14.59 kg (kilogram)
length 1 ft 0.3048 meters (m)
mass density 1 Ib/ft^ 16.02 kg/m^
torque or moment 1 lb • in. 0.113 N • m

acceleration 1 ft/sec^ 0.3048 m/s^
accel. of gravity 32.2 ft/s^ = 386 in./sec^ 9.81 m/s^
spring constant k 1 Ib/in. 175.1 N/m
spring constant K 1 lb • in./rad 0.113 N • m/rad
damping constant c 1 lb • sec/in. 175.1 N • s/m
mass moment of inertia 1 lb. in. sec^ 0.1129 kg m^
modulus of elasticity 10^ lb/in.2 6.895 X lO** N/m^
modulus of elasticity of steel 29 X 10^ lb/in.2 200 X 10® N/m^
angle 1 degree 1 /57.3 radian