Ramps: A Super, Simple Machine! -

Jessi and Squeaks brought home a whole bunch of books! But they aren't quite sure how to get them up the stairs into the house. Join them as they learn about ramps and how these simple machines help us with our work!
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SOURCES:
www.naeyc.org/files/naeyc/Ram...
www.teachengineering.org/less...
dbsenk.wordpress.com/2014/02/...