Scetch on Simon Stevin tombstone
![](https://integraccc.files.wordpress.com/2010/07/plano-inclinado-12.jpg?w=640)
When the object 1N is moving up the inclined level, gains 3x1 joule gravitational energy.
In the same time P is moving down and loses Px5 gravitational energy. Thus 3x1=Px5, and
P=3/5 Newton.
In the same time P is moving down and loses Px5 gravitational energy. Thus 3x1=Px5, and
P=3/5 Newton.
Feynman characterize it as a genius idea to estimate the strength of the force P using the conservation of energy.
![](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Simon-stevin.jpeg/220px-Simon-stevin.jpeg)
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