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Mechanics

Free online mechanics lesson for elementary school,  middle school and high school.
chemistry high school
 




















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Gravity

Potential energy

 
A ball that is dropped upon some sand creates a crater whose dimensions depend on the ball's energy at the time of impact:
more energy for the ball will result a deeper and wider crater.


We can notice the crater's size depends on two factors:
- The size of the crater increases with height of fall
- The size of the crater increases with the ball's mass

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Thus we can conclude that every object owns an energy that depends on its height and it mass.
Such an energy is called " potential energy ".
Potential energy is denoted by PE and can be expressed in Joule.
An object's potential energy increases if its height or its mass increases.


 


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