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Potential Energy

by shounakbhatta
Tags: energy, potential
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shounakbhatta
#1
Jan5-13, 11:03 AM
P: 277
Hello,

Can someone please explain me:

F=G m1xm2/R^2

In potential energy U=mgh

Generally it is also written that:

U=-Gxm1xM2/r+K. How -G comes into play?

Also Newton's above law of Gravitation in vector form is written as:

F_12=-Gm1m2/r12^2 r12

Here also how -G comes into play?

Coming to Gravitation acceleration:
If one of the masses is larger than the other, gravitational field is defines as:

g=-GM/r^2xr_hat

How again -G comes into play?

If somebody can explain in a step by step method.............


Thanks,

-- Shounak
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russ_watters
#2
Jan5-13, 11:35 AM
Mentor
P: 22,298
Upper-case G is the universal gravitational constant. It is basically just a conversion factor. It is negative by convention.
shounakbhatta
#3
Jan5-13, 12:41 PM
P: 277
Hello,

What is the conversion factor?

Does that mean the equation for G and -G are the same?

-- Shounak

tiny-tim
#4
Jan5-13, 03:46 PM
Sci Advisor
HW Helper
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tiny-tim's Avatar
P: 26,148
Potential Energy

Hello Shounak!

This thread is similar to your other thread, http://www.physicsforums.com/showthread.php?t=662573

Is there anything here that has not yet been answered there?


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