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J
jdesai-21-Visitor
1-Visitor
January 10, 2018
Question

Swap between lbf and lbm

  • January 10, 2018
  • 3 replies
  • 5168 views

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

3 replies

M
MJG1-Visitor
1-Visitor
January 10, 2018

Please clarify your problem.  Uploading your file and/or screenshots would be helpful.

Here is what I get:

Capture.PNG

J
jdesai-21-VisitorAuthor
1-Visitor
January 10, 2018

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.

 

 

Untitled.png

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
January 10, 2018

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

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
January 10, 2018

Not sure what your problem is.  In Prime 3.0:

Capture.PNG

V
24-Ruby IV
ValeryOchkov24-Ruby IV
24-Ruby IV
January 10, 2018

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!

J
jdesai-21-VisitorAuthor
1-Visitor
January 10, 2018

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

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