When you push or pull with a simple machine, you are applying a force and doing work. And, if you get more force out of a machine than you put into it, then that machine has a mechanical advantage.
David Rosenberg on MSN
I built a clothes folding machine for only $7 DIY experiment
A simple idea turns into a creative DIY experiment as a $7 homemade machine is designed to fold clothes automatically at home ...
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