ID-0002 Invest in You - Children's Physics & Engineering Coloring Activity with Video and Music
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Engineers know that a building has to be in equilibrium. Take three coat-hangers and three jeans. If you add one at the right end, hanger rotates one way. If the coat hanger gets the jean on the left, it rotates the other way. Buildings are made to have none of it have an unbalanced equilibrium.