Smart questions
Smart answers
Smart people
Join Eng-Tips Forums
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Member Login




Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

Join Eng-Tips
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

aueng06 (Structural) (OP)
3 Aug 06 8:31
Hello All!

A college student I know was recently asking me a question about nomenclature that I was not sure I could clearly answer.  I am hoping that you can provide me some guidance and a more logical explanation to provide him.  

What is the difference between a lbm and a slug and how do each of these translate into lbf?

My thought was that lbm=slug and both when multiplied by gravity/acceleration provide force.  Is this correct, or have I further misguided an already confused college student?
BigInch (Petroleum)
3 Aug 06 12:01
Reprinted from,

Ed Gohmann
Purdue University School of Technology
New Albany, Indiana


In the meter-kilogram mass-second system it is defined that one Newton (N) of force will accelerate 1 kilogram mass (kgm) 1 meter per second squared. Thus for the mkgs system

1/K = 1 N*sec2/kgm/m

or practically

F (N) = m a kgm*m/sec2

A parallel is found in the English system which defines that 1 pound force (lbf) accelerates 1 slug mass 1 ft/s2 resulting in

1/K = 1 lb(force)*sec2/slug/ft

or

F(lbf) = ma  slug*ft/sec2

Quite often in this system mass is given in pounds mass (lbm) with the fact that one slug equals 32.17 lbm. Thus to obtain slugs when given lbm you divide by 32.17 lbm/slug.



   Going the Big Inch! worm
http://virtualpipeline.spaces.msn.com

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close