Potential energy and kinetic energy

In summary, potential energy is the stored energy an object has due to its position or configuration, while kinetic energy is the energy an object possesses due to its motion. These two forms of energy are related, as potential energy can be converted into kinetic energy and vice versa. Potential energy can be calculated using the formula PE = mgh, and kinetic energy can be calculated using the formula KE = 1/2mv².
  • #1
itachipower
10
0
So today in class we were talking about gravity and my professor said that generally KE = -.5PE
And so TME = .5PE

I don't understand how that works.
 
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  • #2
That's the virial theorem, and it holds in that form for interacting masses whose potential energy is proportional to the inverse of their separation (e.g. gravitational interaction). Note that the kinetic energy and potential energy appearing in that equation are averages over time.

http://en.wikipedia.org/wiki/Virial_theorem
 
  • #3
Oh okay! Thanks!
 

What is potential energy?

Potential energy is the stored energy an object has due to its position or configuration. It is the energy an object has the potential to release and do work with.

What is kinetic energy?

Kinetic energy is the energy an object possesses due to its motion. It is the energy an object has while in motion and is directly proportional to the object's mass and velocity.

What is the relationship between potential and kinetic energy?

Potential energy can be converted into kinetic energy and vice versa. For example, when a ball is held at a certain height, it has potential energy. When the ball is released, its potential energy is converted into kinetic energy, causing it to move and gain speed.

How is potential energy calculated?

Potential energy can be calculated using the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the object's height above a reference point.

How is kinetic energy calculated?

Kinetic energy can be calculated using the formula KE = 1/2mv², where m is the mass of the object and v is its velocity.

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