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The History of the Seesaw

Home
Creating the Seesaw
Summary of the Invention
Sources
Modification

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It´s really easy to lift a piece of paper or a feather, but could you lift a sack of rocks? When you try to lift something heavy, gravity pulls against it. The more mass that you´re lifting, the harder the pull. But long ago, people learned to outsmart gravity by using simple machines such as levers.

An object´s center of gravity, or center of mass, is the point where the object is perfectly balanced on all sides, and where the weight of the object appears concentrated. Each person has a center of gravity, too!

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Lever

Levers are a very simple way of reducing the amount of force or effort needed to move an object.


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By HaLeih Burnett
And Bree Barnard