How do you calculate Center of mass

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Homework Help Overview

The discussion revolves around calculating the center of mass (COM) in a physics context, specifically addressing confusion regarding the reference point used in the calculation and how to apply given coordinates.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to understand the reference point in the COM formula provided by their professor. They inquire about the implications of using different reference points and how to handle given coordinates in a system.

Discussion Status

Some participants have offered guidance on selecting a reference point for the calculation of COM. There is an exploration of how to approach problems when specific coordinates are provided, with varying interpretations being discussed.

Contextual Notes

Participants are working within the constraints of homework guidelines, which may limit the information available for solving the problem. The original poster's confusion about the reference point suggests a need for clarification on foundational concepts.

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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?
 
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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.
 
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?
 
MX=m1x1+m2x2+m3x3+...

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

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