Saturday, February 11, 2012

Book Review: "For the Love of Physics"

I recently finished reading the book For the Love of Physics, by MIT professor Walter Lewin (publisher's page for the book). Lewin's passion is teaching and using his signature demonstrations in the classroom. As depicted on the book's cover, for example, Lewin demonstrates the physics of pendulum swings by attaching a cable to the classroom ceiling and serving as the weight (technically, the "bob") of the pendulum himself. Video clips of his classes are readily available online via his faculty homepage and YouTube, which seem to have made him some sort of worldwide cult hero.

Part memoir, part substantive physics instruction, For the Love covers the author's roughly half-century in the discipline. The book may strike some readers as a bit disorganized at first, but I found it to grow on me as I read along. The chapters cover the physical bases of many phenomena that are ubiquitous in daily life, such as rainbows, sound, electricity, magnetism, and energy. If, like me, a decade (or two, or three) have passed since you first learned these concepts in high school or college physics, the book will give you a brief refresher on key definitions and equations.

A good portion of the book is devoted to Lewin's scholarly research on X-ray astronomy, in which he and his colleagues sent balloons equipped with detectors into the skies above Australia. If this specific topic is not of primary interest to a reader, this material may seem to drag on. However, Lewin's stories of how the scientists enlisted residents of sparsely populated areas of the Australian outback to help recover the detectors after they fell back to earth are priceless!

I thought perhaps Lewin would share his decades' worth of wisdom on college teaching -- ideally in a way that would translate to those us of who teach in disciplines other than physics. Indeed, in the final chapter, he discusses how he focuses not on equations and formulas, but on opening up students' minds to new "ways of seeing" the world (with which his in-class demonstrations undoubtedly help). However, a more extensive discussion on pedagogy is lacking. To end on a more positive note, however, For the Love has many elements -- the stories, the demonstrations, the research -- that might appeal to readers interested in physics.