Day 118 – Power Testing

power.PNG

Physics 11 – Today we did some testing on power.  Not assessment testing but seeing “who has the most power?”

I had volunteers run up two sets of stairs, and then we used time and Eg to find which student put out the most power.  As is always the case, the heaviest students have the most power for this short test.

I then told the kids about power curves in athletic performances. I thought a few of my higher achieving students would be interested in this, particularly because they also do high level sports, including nordic skiing.  The idea is that when you model power output from an athlete, you can plot their critical power. Critical power is the average power they can maintain for any particular time period.  In the chart above, Jamar can hold an average of 994 W for 4 s.  As the time interval gets longer, the power gets lower.  This can be modeled in different ways but it typically gets shown as being some type of second order inverse relation.  Endurance athletes, like nordic skiers, are usually most interested in shifting their curve up.  A shorter interval athlete is probably more interested in shifting the curve to the right.  In any event, none of the students were terribly interested in this. This probably helps explain why they don’t really care that much about modeling in general?  Oh, and it was the last day before spring break…

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