- #1
Cozy_Powell
- 9
- 0
I tried to get the potential from the potential energy and I get a positive sign for potential...! I cannot find what I did wrong.
- Gravitational force is conservative so its work W is symmetrical to the change in potential energy U.
- Potential is the work done by gravitational force, per unit mass, to bring a mass from infinity to a certain point P.
Initial position of mass: ∞
Final position of mass: point P
W = - ΔU
W = - (Up - U∞)
W = - (-GMm/rp - (-GMm/r∞))
W = - (-GMm/r + 0)
W = GMm/r
W/m = GM/r
Potential = φ = W/m = GM/r
It should be negative...
Thank you.
- Gravitational force is conservative so its work W is symmetrical to the change in potential energy U.
- Potential is the work done by gravitational force, per unit mass, to bring a mass from infinity to a certain point P.
Initial position of mass: ∞
Final position of mass: point P
W = - ΔU
W = - (Up - U∞)
W = - (-GMm/rp - (-GMm/r∞))
W = - (-GMm/r + 0)
W = GMm/r
W/m = GM/r
Potential = φ = W/m = GM/r
It should be negative...
Thank you.