Notation:

Book 
By hand 
Scalar 
a 
a 
Vector 
a
(bold faced) 
a or _{} 
Units:


SI 



Mass 
M 
kilogram 
kg 
slug 

Length 
L 
meter 
m 
feet 
ft 
Force 
F 

N 
pound 
lb 
Time 
T 
second 
s 
second 
sec 
Relation
between units is based on the equation F=ma:
1 N = (1 kg) (1 m/s^{2})
1
lb= (1 slug) (1 ft/sec^{2} )
Example of calculating mass in _{} 
Unit conversion:
l lb 
= 
4.4482 N 
1 slug 
= 
14.5938 kg 
1 ft 
= 
0.3048 m 
1 ft 
= 
12 in 
1 mile 
= 
5,280 ft 
1 kip 
= 
1,000 lb 
1 ton 
=

2,000 lb 
Rounding numbers:
Round your final answers to 3 significant
figures
_{}
Check
equations by checking that all terms in an equation have the same dimensions
ã Mehrdad Negahban and the University of Nebraska, 19962003.
All rights reserved
Copy and distribute freely for personal use only
Department of Engineering Mechanics,