Lever Principle
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This app shows a symmetrical lever with some mass pieces each of which has a weight of 1.0 N. The lever arms can be read from the coloured rectangles; one rectangle corresponds to 0.10 m. The lever is in balance when the app is started.
You can attach a new mass piece or put it to another place with pressed mouse button. In a similar way you can remove a mass piece by clicking on it.
Lever Principle:
A lever is in balance if the total left side torque is equal to the total right side torque.
Link to the original page: https://www.walter-fendt.de/html5/phen/lever_en.htm