Saturday, March 26, 2022
Wednesday, March 23, 2022
Wednesday, March 16, 2022
Fundamentals of Physics by Halliday, Resnick, and Walker, he was a pioneering popularizer of physics, even appearing on The Tonight Show with Johnny Carson. He authored "The Amateur Scientist" for Scientific American and the classic, The Flying Circus of Physics — With Answers. [The Flying Circus of Physics (without answers) was published and can probably be found by skilled book hunters.
I was a fan of Walker and his work when I walked into my classroom for the first time. So when I saw that The Kinetic Karnival of Jearl Walker, filmed, produced, and broadcast just a few years prior was available for purchase, I directed my school budget to do so.
Tuesday, March 15, 2022
We eventually get to this guided classroom discussion, where we learn more about how impact time affects impact force. Examples are cited, and videoclips are featured. I took a flying leap from the historic Victoria Falls Bridge between Zambia and Zimbabwe in the name of science. A Victoria Falls bungee mishap is also shown. As is a GoldenEye 007 bungee stunt, and a skydiver who chooses not to use a parachute.
Sunday, March 13, 2022
But when I wanted to work through the derivation of Newton's universal gravitation equation, I thought it would be amusing to sequence it as a series of queries. As I often did with my lab reports in The University of Michigan's Physics 403 optics lab (c. 1985), where a young Dr. David Gidley indulged my creativity, I designed the document to look more of the era of Newton. (My reports incorporated such eighteenth-century anachronisms as "opticks" and "reflexions". Dr. Gidley was a good sport.)
Student document (print-friendly Google Docs file on Google Drive)
Instructional presentation (link embedded in the answer key)
Thursday, March 10, 2022
The bundle opens with a PhET-fueled simulation lab activity that I used as a precursor to an in-class, hands-on experiment involving carts and motion tracking (not included here).
Next we have an in-class (in-Zoom?) direct instruction activity fleshing out Newton's Second Law via a series of fanciful shopping cart races.
Tuesday, March 8, 2022
Two dart guns are fired toward the ground simultaneously. One fires a light dart, the other fires a heavy bullet. Which dart hits the ground first?
I use this demonstration after teaching all three of Newton's laws of motion. Students identify, discuss, and debate possible outcomes before the demonstration is carried out. The presentation includes a carefully crafted slides and compelling high-speed video.
This one is among my favorite demonstrations in mechanics.
So if the calculation of the launch speed inspires déjà vu, there's a good reason for that. We do ponder where that speed would be legal for a motor vehicle.
Forces and Motion: Basics. In the Net Force section, a tug of war can be arranged with various players. If teams are composed symmetrically, neither will win. But there are other ways to bring about a tie. And what happens if one team is winning, the sim is paused, and the teams are recomposed so that the forces are now balanced, and the sim is unpaused?
In the Motion and Acceleration sections, the relationship between force, mass, and acceleration can be observed. And did you make your your mannequin faceplant?