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11-Garnet

## Swap between lbf and lbm

Hello,

If something weighs 10 pounds, I put M=10*lbm

The inertial load factor is LF=100gs (100 gees)

The force will be M*LF= 10*100=1000lbf

Why does MC screw up the units? I remember, if I used M*LF*g  then it used to revert to lbf. It does not do so today.

What is the best way to do this

8 REPLIES 8
18-Opal
(To:jdesai-2)

Here is what I get:

11-Garnet
(To:MJG)

Never mind Fred. I just need a strong cup of coffee. It works now. Thanks

BTW. Do you need the * when you type in the units manually. I noticed you don't. Do you insert the units with a keyboard stroke or do you pull down and mouse it in from the pull down menu.

23-Emerald I
(To:jdesai-2)

You can type most units; may need "cntrl-Q" twice to get the labels right.  (is it a variable, a unit, a constant, a . . .)

23-Emerald I
(To:jdesai-2)

Not sure what your problem is.  In Prime 3.0:

24-Ruby IV
(To:jdesai-2)

When I was at school, I learned that weight (not mass) should not be measured in grams, but in newtons (SI). We went to the store and asked the saleswoman to weigh 5 newtons of sausage!

11-Garnet
(To:ValeryOchkov)

Hmmm. Did Newton get hit in the head with a sausage? I thought it was an apple:)

14-Alexandrite
(To:ValeryOchkov)

lbm -  pounds mass

slug -  mass

lbf -    pounds force

kg -    kilo grams mass

kgf -   kilo gram force.

Newton -  force

I once had an UK engineer use kg and Newtons in the same sentence, both referring to force (load cell rating).  And you thought our system was confusing.

24-Ruby IV
(To:ValeryOchkov)

Here must be newtons, dyne, gmf, kgf, lbf, ozf etc not gm, kg, lb, oz etc

We can use this device on Moon too...

I use it in airports! What is more impotent for aircrafts mass or weight of my baggage?

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