With all the talk of machines, work, mechanical advantage and efficiency I decided to pick three of the simple machines the book talked about and cobble together a lab on them. While my physics students were doing the lab I thought this would be great for Algebra 2 (or even Algebra 1). None of the math is hard; it's all proportions: work in = work out, or (distance moved)*(force input) = (distance moved)*(force output).
Anyway, raid your physics lab for some pulleys, meter sticks, weights and spring scales and have a grand old time of it.
I expect you may have to rework some of the questions; nothing I do is every perfect the 1st time. If you have any suggestions for changes, let me know, I'm all ears.