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