Hot New Products Auto Parts Q02 for European Factories
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In this Design Squad Nation animation, Judy explains how the use of small steel balls can decrease friction and increase efficiency in a bearing, allowing a wheel to spin freely. For more Design Squad Nation fo to http://pbskids.org/designsquad
Like cars? Watch this clip and learn to build your very own balloon-powered car! http://youtu.be/K8hu5Y-9AZ8