Course: How Things Work: An Introduction to Physics
Length: total ~14 hours
Instructor: Louis A. Bloomfield
Quote:An introduction to physics in the context of everyday objects: It’s essentially case study physics, an introduction to physics in the context of everyday objects and activities. My goal is to make physics useful, and to help you understand and manage the physical world around you.
In the 1994 Law & Order episode “Big Bang,” ADAs Ben Stone and Claire Kincaid are investigating a physics professor whose defense involves serious particle physics. In private, Stone confesses to Kincaid: “You know what I took for my science requirement? Physics for Poets.” Kincaid confesses back: “Elementary Geology. Rocks for Jocks.” This course is essentially Physics for Poets: general concepts peeled down to their simplified forms, presented via concrete examples with minimal math.
It’s one of the oldest classes on Coursera’s roster, making its debut back in 2013, and I’ve been thinking about taking it since about then. But stubbornly, I kept trying the “real’ physics courses and quitting by week 3 when I still couldn’t keep joules, newtons, and watts straight. Now that I finally cried Uncle and got here, I wish I’d done it sooner.
Each of the six weeks focuses on an object that demonstrates a related group of concepts. Skateboarding, for example, introduces force, inertia, and acceleration. I’d never considered weight as a force before (it’s usually ignored in favor of mass), but it makes a lot of sense in this context. And by spending a couple of weeks focusing on force – that is, newtons – I was much better able to grasp the idea of joules when we got to energy later on. For me, that alone was worth taking the course.
The other objects are falling balls, ramps, seesaws, wheels, and bumper cars. I can say I saw a lot of things more clearly, such as what’s a force and what isn’t, and what properties are conserved. By comparing linear velocity and momentum to angular velocity and momentum, the course helped me keep a lot more organized. I’m still a little confused about some stuff, but it’s not a total jumble.
The professor is very hands-on – and feet-on and butt-on – as he skateboards, rolls on a cart, tosses balls out of windows and across rooms, tips small levers and puts TAs on seesaws, pulls wagons around, plays air hockey to simulate bumper cars, and does everything he can to demonstrate various kinds of forces and accelerations while also showing off the UVA campus. There is some math, but very little, and it’s of the a=b*c variety, very simple even for me. In fact, after I finished the course, I went back and dragged out the formulas that tended to get buried in the long runs of explanation. This also was a very worthwhile process for me.
The course starts with a Preliminary Assessment before any teaching takes place. This is graded; for those of us who don’t sign up for the “Certificate Experience” (I guess they gave up on verification), this is the only grade you’ll see. There are ungraded (but very useful) questions embedded in the videos. Each week ends with a quiz that you can take if you’re auditing, but you can’t find out what you got right or wrong (unless you’re determined and creative, in which case you might discover students from years before have left a trail of breadcrumbs some of us might find useful. And some of us might find, for those intending to earn a grade for this, to be cheating, if relatively worthless cheating). A final exam similar (at times identical) to the Preliminary Assessment finishes things off in Week Seven.
There are some tricky concepts, but it’s basic mechanics presented in such a way as to give students more of a sense of what is actually happening than the equations they’ll see in a more typical physics course. I’m going to take another stab at a physics course, and see how much of a difference this made. I’m hopeful.