I posted previously about how I designed a new worksheet to directly address the problem where normal force changes directions depending on speed for vertical circles, and today I saw the fruit of that worksheet. I had two groups whiteboard each section and then present together. These groups assumed normal force was in different directions for part c, and the answers came out the same with opposite signs. The worksheet forced them to address the direction of normal force, and reconciled it at the end by finding the speed of the coaster if normal force is zero. Most of the material I use I’ve stolen from the normal modeling materials and Kelly O’Shea, but this is one I’m really proud of because of the great thinking and discussion that resulted. The worksheet can be found in my CFPM packet.
Today I finalized my Projectile Motion Packet, once again with heavy borrowing from Kelly. I realized after reading her post about model building that I was able to cut a bunch of fluff from the unit, which is awesome because I’m more than a week behind compared to last year and this allows me to catch up while offering my students what I think is a better, more concise model building experience.
I finished the UBFPM packet today, but I won’t be printing for a couple days yet. The packet is here, and you have comment rights. Have at it, I’m always loving feedback. Or comment here. Or on Twitter.
Addendum: I forgot to mention that I once again borrowed heavily from Kelly.
I just finished up (I hope) this year’s BFPM packet, borrowed heavily once again from Kelly. I am particularly looking forward to whiteboarding the problem above, it’s going to be pretty tough for students. I’ve recently had a lot of luck writing problems based on images I find with simple Google searches like “Two boxes ramp physics.”