- #1
SecretSnow
- 66
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Hi guys, I understand that g is by definition positive, as in the Gravitational field strength. However, my school's notes has defined g as
-(GM)/r^2. I don't understand what's that negative sign for, and in what scenario is the negative sign used? By the way, it also defined g as -(d phi/dr) where phi is the gravitational potential and d is the differentiation sign...in this case, it says F=-Gmm/r^2.
Thanks a lot!
-(GM)/r^2. I don't understand what's that negative sign for, and in what scenario is the negative sign used? By the way, it also defined g as -(d phi/dr) where phi is the gravitational potential and d is the differentiation sign...in this case, it says F=-Gmm/r^2.
Thanks a lot!