Find CG Point: Step-by-Step Guide

[IPhO' 2008]

Can you tell me how to find CG. point.
thank you.

 

[Redbelly98]

Holding the object in your hand, find out where you can hold it so that it does not tip. That is the CG point.

p.s. welcome to Physics Forums

 

[IPhO' 2008]

Someone tell me that it uses about torque to find CG. point.

 

[YellowTaxi]

Easiest way is to hang it loosely from a piece of string. The string is then always pointing at the CG.
I said loosely so that the string hangs perfectly vertically.

 

[lubuntu]

Someone tell me that it uses about torque to find CG. point.

It uses about torque to find CG. point.

 

[Redbelly98]

IPhO' 2008, hopefully YellowTaxi's post has answered your question. If things are still not clear, you will have to provide more details. Please tell us what object you trying to find the center of gravity of, or give a specific example.

 

[IPhO' 2008]

Something likes Mountain or a very big object. CM and CG point is not the same position .
I know how to calculate the CM point but I don't know to calculate the CG point.

 

[TurtleMeister]

I think CM and CG are the same point in most cases. The only exception would be for an object in a gravitational field where tidal forces are detectable.

 

[Redbelly98]

Something likes Mountain or a very big object. CM and CG point is not the same position .
I know how to calculate the CM point but I don't know to calculate the CG point.

You would follow the same procedure as for CM, except that instead of mass m you would use the weight mg.

If your formula relies on mass density ρ, then replace that with ρg instead.

Note that g is a function of location, not a constant.