Let's Get Rolling!

Jessi and Squeaks found a ton of rocks for their rock collection... but they're too heavy to get back to the fort! Join them as they figure out the perfect simple machine to help them out: the wheel and axle!
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SOURCES:
http://easyscienceforkids.com/kids-the-wheel-and-axle/
https://dbsenk.wordpress.com/2014/02/05/simple-machines/
http://electron6.phys.utk.edu/101/CH2/wheels.htm
http://jiwismachines.com/lessons/ep3/Wheel%20and%20Axle%20-%20Jiwi's%20Machines%20Ep%203.pdf
http://jiwismachines.com/lessons/ep1/Toast%20Bite%20-%20Jiwi's%20Machines%20Ep%201.pdf