Flywheel and energy storage

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Main Question or Discussion Point

What is energy?How a flywheel stores energy? What is the physics behind that?
 

Answers and Replies

FredGarvin
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Inertia. A flywheel is meant to have a mass that is, compared to the system it is in, rather large. Once the flywheel is brought up to operating speed, it's inertia helps to eliminate or reduce speed fluctuations in the system.
 
Meir Achuz
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The energy in a flywheel is E=(1/2)Iw^2.
By making the wheel rotate, this energy can be stored.
The energy can later be used by connecting to the rotating wheel.
 
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Energy is the ability to do work.
 
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No, I think the abillity to do work is potential energy. Energy is the sum of kinetic energy and potential energy.
 
Gza
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pocoman said:
No, I think the abillity to do work is potential energy. Energy is the sum of kinetic energy and potential energy.

So you are implying that only potential energy can do work? How would you explain a collision situation when an object (such as a billiard) collides with another billiard to change the kinetic energy of the collided billiard(changing it's velocity to a nonzero value, thereby giving it a kinetic energy)? (any change in energy is caused by work being done, therefore the colliding billiard did work on the collided billiard.)
 

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