The graphical solution bug has really gotten me this year (and in the best possible way). I’ve apparently done such a good job of pushing the graphical solutions that one of my classes stopped me in my tracks while I was showing them how to solve force problems by breaking the forces into components and… Read More Force Vector Addition Diagrams (or, Components No More!)
“LOL diagrams are my life.” —Honors Physics student from 2010 I have to admit, first of all, that I wasn’t expecting to love energy bar charts (when I first heard about them). I didn’t originally learn to solve energy problems that way, and when I first saw them, I thought it was a silly waste… Read More Energy Bar Charts (LOL Diagrams)
After starting to build the Energy Transfer Model (ETM), we have the beginnings of an idea about change in energy. In order to start playing around with energy transfer, we need a common vocabulary. The front of the packet gives students a place to write down the information. It is handy to use as a… Read More Common Types of Energy (ETM Cheat Sheet)
Hey guys, bring a pencil and a calculator next door. I want to show you something that’s been bothering me a lot. Springs are strange I’ve been thinking a lot about springs. They’re sort of odd, you know? When you hold them like this [hold spring looped to one finger on each hand and stretched… Read More Building the Energy Transfer Model
Before we can start building the Balanced Force Particle Model, we have to overcome some language problems. As was frequently said at the Modeling Workshop that I attended (and is repeated frequently in my classroom), “Physics is a foreign language that sounds just like English.” The word force is a prime offender, so we need to… Read More Common Types of Forces (BFPM Cheat Sheet)
aka How to kill . Now that we’re pros (Wheaties box, here we come) at drawing velocity-vs-time graphs, we need to be able to turn those graphs into equations if we want to use them as tools for solving problems. One big stumbling block in solving constant acceleration (CAPM) problems is that, very very often,… Read More Velocity Graphs into Equations
Disclaimer: I most certainly did not come up with this type of diagram, though the name (IF charts) is probably unique to my classes since it’s based on the way one of my first Modeling Physics students drew her bar charts. This post is meant to be a how-to and a why-to guide for the… Read More Momentum Bar Charts (IF Charts, IFF Charts)
Hey guys, bring a pencil and a whiteboard next door. I want to show you something cool. [Wave them over to the lab. At the front table, there are two tracks set up to make one long track (half of which is a ramp). Two carts and some extra masses (blocks) are at the ready.]… Read More Building the Momentum Transfer Model
Hey guys, I want to show you something cool. Bring your new packet and a pencil and come next door. Make sure the stools are out of the way or someone’s going to get themselves killed in this experiment. Stand on the other side of the table. Don’t stand at the end there; you’re going… Read More Building the Unbalanced Force Particle Model
Hey guys, I want to show you something cool. [As they came in, you discussed the uber-important catching the cart with the student sitting near the end of the ramp.] Whoa, that was pretty cool, huh? Want to see it again? Of course you do. [Let the cart go down the ramp again.] Cool. Okay, so… Read More Building the Constant Acceleration Model
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