Comments on: [Confab] Design A New Function Carnival Ride

By: dy/dan » Blog Archive » [Confab] Circle-Square

dy/dan » Blog Archive » [Confab] Circle-Square — Thu, 27 Feb 2014 03:31:51 +0000

[…] Desmos team asked you what other Function Carnival rides you'd like to see. You suggested a bunch, and the Desmos team […]

By: Dan Meyer

Dan Meyer — Thu, 20 Feb 2014 01:41:11 +0000

You guys should head to this link, check out the new rides, and offer some feedback. Which ones should we include in the carnival? Which should we abandon?

By: Neil Marshall

Neil Marshall — Wed, 19 Feb 2014 21:09:12 +0000

There is some great stuff around the winter Olympics at the moment…..ski jumping, slopestyle snowboarding as they zip up those curves and do acrobatics…..distance and speed is interesting.

We were discussing this earlier….it seems easier to ask them to graph the horizontal speed and vertical speed….velocity is a vector and asking for speed is hard as it is the length of this vector…

By: Kevin Hall

Kevin Hall — Wed, 19 Feb 2014 19:05:30 +0000

@Eli, hmm, well it is now, but it didn’t seem to 10 minutes ago. Either you fixed something or I was looking at the velocity activity by accident.

By: Eli

Eli — Wed, 19 Feb 2014 18:50:00 +0000

@Kevin — bumper car “distance travelled” isn’t showing multiple values? Or the bumper “velocity along path”?

Latter one’s here:
https://labs.desmos.com/carnival/scenario/bumpervelocity#bumpercars

By: Kevin Hall

Kevin Hall — Wed, 19 Feb 2014 18:45:23 +0000

The bumper car activity uses “distance traveled” in a confusing sense. If I travel 3 ft. forward, and then reverse 3 ft., I’ve actually traveled 6 ft. total. You really mean “displacement”, but that’s confusing because students aren’t familiar with the term, and 2-dimensional displacement can be complicated.

In addition, the bumper car activity has strange behavior when I draw a graph that’s not a function. I think the activity used to show multiple cars at the same time, but now it doesn’t. So if I draw a graph that’s a loop (or Jenny’s graph from the writing prompt), it gives me the wrong simulation of what that would mean.

By: Function Carnival | rawsonmath

Function Carnival | rawsonmath — Sun, 16 Feb 2014 17:54:44 +0000

[…] difficulties. Take the Function Carnival currently under development by Christopher Danielson, Dan Meyer, and Desmos. Honestly, I don’t know how they do it over there at Desmos, but these little […]

By: Jim Hays

Jim Hays — Sat, 15 Feb 2014 18:10:29 +0000

A couple of pieces of feedback:

1) Awesome! Thanks for putting this together! I think you worked out a good way of doing velocity.

2) On the zipper, it goes up too high and too low… The correct height goes off the graph when I try to draw it. Not sure what’s going on with that.

3) I presume y’all will come up with more tailored “misconception” graphs for the second slide (for example, have students respond to feedback about a student who draws a graph with a loop for the roller coaster.

4) What about both position and velocity graphs at the same time? Perhaps one is editable and the other is just shown? Or perhaps both are editable? Obviously there are multiple ways to present the position graph based on the velocity, but something akin to whatever formula you currently use to display the roller coaster car could be used.

By: Eric Berger

Eric Berger — Sat, 15 Feb 2014 01:39:35 +0000

And here’s one more scenario for feedback. Here’s an implementation of the zipper (Thanks, Chris!), which we thought was a good example of all the cycle-in-a-cycle ideas that Chris, Jonathan, and Megan were proposing.

https://labs.desmos.com/carnival/scenario/zipper

By: Eric Berger

Eric Berger — Fri, 14 Feb 2014 23:26:25 +0000

As promised, we’ve built a couple more scenarios based on your ideas. We built Adam’s recommendation of a roller-coaster with a loop in it to demonstrate that although the track has a loop, the graph of height vs time doesn’t:

https://labs.desmos.com/carnival/scenario/rollercoaster#rollercoaster

We also followed Chuck and John’s advice to try graphing velocity vs time on a roller-coaster to provide a more challenging scenario, and to show that the graph isn’t shaped like the track:

https://labs.desmos.com/carnival/scenario/rollercoastervelocity

Do these look like what you were envisioning? Do they inspire any more ideas?