swing training - like my tennis ball on a string:


Dan Martin Golf

Do You Swing The Club Head or The Handle? Or Neither?

https://www.youtube.com/watch?v=yVp0ms74gNE

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Trebuchet


design / build / optimising

more maths and explanation

https://www.youtube.com/watch?v=-gn2RGPqe_A

https://www.youtube.com/watch?v=mXhLdz-Qmsk

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more fun, Age of Empires war game, big stuff

build

https://www.youtube.com/watch?v=jcYFUNm2GIM


how it works

https://www.youtube.com/watch?v=xgm9EzdCZXI


more chucking stuff

https://www.youtube.com/watch?v=w1U1y0mwpYw

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