Ohhh man. This could take two lessons, actually. Make just with pins and cardboard.
How to do without maths? Could take a few standard linkages and play with them
Standard 4-bar linkage (boom)
Crank and slider linkage
Introduce lever as two-bar linkage?
RESEARCH: Good way to teach about linkages without maffs. Also, to teach about linkages in terms of FORCE and in terms of movement paths.
Also, a good way to design linkages.
Could split into two lessons, one with a small (controlled) design challenge, and a few examples of linkages, the next lesson, they build their own linkage-controlled object.
I really need to play around with a lot of lego. Like, a lot of lego. Grashof mechanisms! Dey cool.
It is sort of cool to have the kids play around with linkages on a piece of paper.
Instant center. Read up lots on linkage design!
Extending linkages (scissor linkages)
Probably a two-parter
Way to map things. Draw a picture! Spirograph?