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Anonymous Poster

Is There Such a Formula?

10/05/2010 10:50 AM

I am trying to remember a formula that a part of it, is the fraction:

(m1*m2)/(m1+m2),

where m1 and m2 are the masses of two bodies.

I must say, I am not sure if such a formula exist.

Thanks.

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Power-User

Join Date: Mar 2009
Location: United Kingdom
Posts: 308
Good Answers: 28
#1

Re: Is There Such a Formula?

10/05/2010 1:18 PM

Gravitational Force between 2 objects?

gForce = (GRAVITY * (mass1 * mass2) / (dist*dist))

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Anonymous Poster
#2
In reply to #1

Re: Is There Such a Formula?

10/05/2010 2:00 PM

Sorry, no. In the denominator of the gravity formula , there is distance^2

In the formula I search, it should be (m1+m2)

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Guru

Join Date: Nov 2007
Location: Sherwood Park, Alberta, Canada
Posts: 1212
Good Answers: 74
#3
In reply to #2

Re: Is There Such a Formula?

10/05/2010 7:46 PM

Suppose you have two masses, m1 and m2 separated by distance d. Say that the centroid of the two masses is x from mass m1.

x = m2*d/(m1 + m2)

m1*x = m1*m2*d/(m1 + m2)

m1*x/d = m1*m2/(m1 + m2)

x/d is dimensionless, so the expression has units of mass. It represents the moment of either mass m1 or m2 about the centroid when d = 1.

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Bruce
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Anonymous Poster
#4
In reply to #3

Re: Is There Such a Formula?

10/06/2010 2:24 AM

Thanks ba/ael.

This is what I was looking for.

It represents the moment of either mass m1 or m2 about the centroid when d = 1.

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