All Questions
3
questions
0
votes
2
answers
876
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Why there is a negative sign on the gravitation formula?
It all started when I was coding some simulation of the Newton's Law of Gravitation and Culomb's Law.
When I was seeking information on the internet, I found out that some people wrote this formulas ...
- 1,525
0
votes
3
answers
499
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How do I get the negative sign in the expression for Gravitational Potential Energy?
From universal law of gravitation, gravitational force exerted on a body of mass m by another body of mass M is
$$ \mathbf F = \frac{GMm}{x^2} $$
where x is the distance between the ...
17
votes
2
answers
13k
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Why add a minus sign in the formula for gravity?
Why do we add a minus sign in our formula for gravity,
when we might as well choose the unit vector $r_{21}$, instead of $r_{12}$?
I'm just wondering why we choose this convention. Is it because it'...
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