This is the sort of thing I want to do more of with my students.

Talking Physics

Free-body diagrams are a pretty useful tool and I wanted to devote a little time to talking about the ones I created for the Danny Macaskill video.  In particular look at the short clip starting at 50 seconds:

I had originally thought he pushed down with his hands and feet but in viewing the video I see I was wrong.  What he does is pull the front wheel up, then push himself up with his feet.  I realized this when I was doing a video analysis, which I’ll post in a bit.

To create the free-body diagram (FBD) I made a few assumptions and simplifications.  I ignored all horizontal forces and just focused on vertical forces.  I also assumed the rider and bike have similar masses and therefore similar weights.  I don’t have numbers, but if the bike was too much heavier than him it would be hard to pull…

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About J Martens

Educator living in Vancouver and working in SD37 Delta. Supporting Numeracy while learning how formative assessment, literacy, inquiry, and technology serve to improve learning and increase engagement (for teachers & students).
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