How do you calculate Center of mass

  • Thread starter okgo
  • Start date
  • #1
okgo
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Homework Statement



I'm confused about how to find the center of mass
http://www.screencast.com/users/ntrinh3/folders/Jing/media/a9773d23-38f1-4d28-a6f8-3b681d42d4c2

and

http://www.screencast.com/users/ntrinh3/folders/Jing/media/bfb40c40-0068-41e8-ac83-2146e1df3330

Homework Equations


So the equation my professor gives Cm=sum of MR/sum of masses


The Attempt at a Solution


Where exactly is this R reference point?
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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You just pick a point, for example if you pick your reference as the 2kg mass, then your COM will be measured from there.
 
  • #3
okgo
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oh so that's it.

How about if they just give you the x-coordinate in a system? exe:

http://www.screencast.com/users/ntrinh3/folders/Jing/media/010db89d-7781-4262-aa79-57eaf706730f

do you just add all of the x-coordinates and divide by how many points?
 
  • #4
rock.freak667
Homework Helper
6,223
31
MX=m1x1+m2x2+m3x3+...

the 'x's are measured relative to wherever you take your reference point as.
 

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