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Download the one sprite and 3 scripts of "AwfulKanwful" and open it in Scratch Project Notes
Discussions in the forums about detecting slope, combined with a recent show about Evel Knievel that I saw on the History Channel, prompted me to work on an Evel tribute. The bike uses the color of its wheels to detect terrain and act accordingly. The scripts started out pretty complicated and ran rather slowly, but after some whittling down, it now works pretty well. Lots of comments are included to help explain how the simulation works. In essence, the bike move the direction that it's pointed unless it isn't touching the ground. In this case to moves by the Vx and Vy that it was previously, and decreases Vy by the amount of "Gravity". It would be possible to count how many times the bike was touching the ground to determine how hard it hit and cause a "crash". This would be pretty fun on a scrolling background, or in a project where you could draw your own "ramps".
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Hi EdnaC - Yes, I built the boat that you see in that picture. It's not a kit boat though, that is a skin-on-frame built from Chriss Cunningham's book "Building the Greenland Kayak". I like it because it is very light (36 lbs) and low to the water which suits my low paddling style.
I love the idea of using the actual tires for the slope detection! I just finished my slotcar racing game, that uses the same idea to stay on the track.
I don't mean to spam, but, if you like physics, you might want to check out and make a remix of my project: perfect circular bouncing perfect simulation
WOW, this is a really advanced project, it's cool that you can control the bikes velocity!
Thanks much for the comments. My original attempt was choppy and awful, my "epiphany" was realizing that to make it run, there was no time to compute, make corrective moves and fancy calculations, then get moving again. The key was to detect, correct, move, repeat. It took lots of trial and error to get to this point. It could certainly get better, sometimes the bike leaps like a horse!
Hey, this is action-packed physics, beautifully done! I like your idea to make a game where you can draw your own ramps, too.
Wow. Nice simulation. Very accurate but at the same time smooth enough that someone could make a game based on it.
Very nice, you just need a beat-up guy with a colorful jumpsuit to ride it!