Today we discussed the rotational kinematics assessment the kids took on Friday. It continues to amaze me that even after a full semester with me, most of my students still reach for the equations….Here is problem I gave them on the assessment
It is REALLY easy to solve with an angular velocity-time graph, but tougher and longer with the equations… sigh.
We also looked at sample tangential velocity problem I asked the students work on over the weekend.
That’s a picture of some wind turbines all my students have seen many, many times. I asked them to determine the speed in miles/hour for the tip of the blade. I provided them with the pdf of the design specs. The blade length is 134 ft and the operational rate is 14.4 rev/min….. the answer surprises most 138mi/hr.
After that we developed the concept of radial (or centripetal) acceleration. I prefer radial because they are less likely to confuse it with centrifugal AND we hit a vertical circle we can discuss a tangential acceleration more easily.
We WB’ed the same set of motion pillars we used with the Advanced class. I had 3 groups CYOP (create your own problem). One I used as an exit formative assessment, the other twoI will use as additional formative assessments. We also just briefly started discussing how to draw force diagrams. More on this tomorrow.