Question

What is the difference between potential energy and gravitational potential energy?

Answer 1

@matt101

Answer 2

Hi

Answer 3

Gravitational potential energy is a specific type of potential energy. Other types of potential energy include electrical potential energy, chemical potential energy, and elastic potential energy.

Simply put, potential energy is any type of "stored" energy. It usually arises due to the relative position of an object in some kind of field (e.g. a gravitational field or electric field).

Answer 4

Does gravitational potential energy mean it is related to Fg?

Answer 5

Because I believe that PE= mgh and it is the same as PE= Fgh

Answer 6

In a way. The general equation for gravitational force is:

\[F=\frac{GM_{1}M_{2}}{r^2}\]
The equation for gravitational potential energy is:

\[PE=\frac{GM_{1}M_{2}}{r}\]
You can see these two equations are very similar and in fact you can say:
\[F=\frac{PE}{r}\]
If we're close to earth and changes in the gravitational field are less important, the force equation simplifies to F = mg, and the potential energy equation simplifies to PE = mgh. These are the equations you're talking about. Once again two very similar equations, that you can combine to get PE = Fh, or F = PE/h, which has the same meaning as the equation above. This equation gives you another way to "define" force: it is the amount of potential energy an object has per unit distance (from a reference point) in the gravitational field.

I hope that made at least some sense...but if it didn't I'm happy to clarify!

Answer 7

Yes it made kind of sense, but do you think if I see gravitational potential energy, I can consider it as Potential energy? I am a grade 11 student, and in physics, students are only working with kinetic, potential, work and these stuff.

Answer 8

If all you have learned so far is gravity, then yes, you can assume PE=mgh.