Almanacs in Astronomy Classes

In memory of my maternal grandmother Dorothy Marie Blalock Clark (1912-1997) TL;DR: Ubiquitous farmers’ almanacs are an inexpensive printed source of accurate astronomical information despite being mostly advertising vehicles. This information can be used in the classroom to generate questions and learning about not only astronomy, but also history, mathematics, and computation.  Thanks to my […]

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Two Different Obsevers, Same Class

I’m going to present two observers’ accounts of a classroom observation that took place on April 24, 2018 beginning at 9:30 am. The class was an introductory astronomy class with eight students on the roster, five of which stopped attending without withdrawing (faculty are now forbidden “by law” from withdrawing students) and three of which […]

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Vector Formalism in Introductory Physics IV: Unwrapping Cross Products Geometrically

TL;DR: Vector cross products are not like products of real numbers, for which there is an inverse operation to “undo” multiplication. I don’t think we should introduce cross products as a form of “multiplication” in introductory physics courses because it may reinforce the urge to “divide by a vector.” A better approach may be to […]

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Proving the Absence of Length Contraction Perpendicular to Velocity

When teaching conceptual physics, students almost always ask why length contraction only occurs parallel to velocity and not perpendicular to it. That’s a meaty conceptual question and one that always leaves me looking for a convincing, non mathematical explanation. Earlier this semester, I finally found what I think is the best one I’ve ever heard […]

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Musical Thoughts On Teaching Physics

TL;DR There are many lessons physics teachers can learn from music teachers about teaching one’s discipline. Many, and perhaps most (all?), concepts in music have analogs in physics and mathematics. I have a background in music, spefically percussion. Marching band was my life in high school and that carried over into my college years. I […]

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Vector Formalism in Introductory Physics III: Unwrapping Dot Products Geometrically

TL;DR: Vector dot products are not like products of real numbers, for which there is an inverse operation to “undo” multiplication. I don’t think we should introduce dot products as a form of “multiplication” in introductory physics courses because it may reinforce the urge to “divide by a vector.” A better approach may be to […]

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Vector Formalism in Introductory Physics II: Six Coordinate-Free Derivations of the BAC-CAB Identity

TL;DR: The BAC-CAB vector identity is probably the most important vector identity, and has potentially important applications in introductory physics. I present six coordinate-free derivations of this identity. By “coordinate-free” I mean a derivation that doesn’t rely on any particular coordinate system, and one that relies on the inherent geometric relationships among the vectors involved. […]

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A Sordid Little Story…

I want to tell a story. It addresses a taboo topic: workplace issues. It is important to make the community aware of these issues, especially for younger teachers going into the two-year college environment, expecially in certain regions. The landscape is changing in some states, and not in good ways. This story could be set anywhere […]

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