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Not an app, but cool. Simples Machine Game - Bicycle at Duckie Deck. (online game)

Bill Nye on Simple Machines! (Video)

BrainPOP - Animated Educational Site for Kids - Science, Social Studies, English, Math, Arts & Music, Health, and Technology

Step away from the iPad once in a while, and build something with your kids - like this Balloon Ride!

a great way to explain what a lever is for Simple Machines