- #1
unknown_2
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Hey, I'm having some difficulty calculating couple moment. i understand that [tex]\sum[/tex]M = [tex]\sum[/tex]Fd. here's an example:
it asks to resolve the couple forces.
the answer is:
(4/5)(60lb) = 48lb
and
(40lb)(cos30)
[tex]\sum[/tex]M = -(48lb)(4ft) + (40lb)(cos30)(8ft)
Now, i don't understand why "-(48lb)(4ft)" is negative. I'm not sure when to use a negative value. Can someone explain this to me?
Cheers
it asks to resolve the couple forces.
the answer is:
(4/5)(60lb) = 48lb
and
(40lb)(cos30)
[tex]\sum[/tex]M = -(48lb)(4ft) + (40lb)(cos30)(8ft)
Now, i don't understand why "-(48lb)(4ft)" is negative. I'm not sure when to use a negative value. Can someone explain this to me?
Cheers