http://www.test-tube.org.uk/morestuff/bikesim_index.htm

Haven't watched it, yet. 
Still watching all these physics videos:
http://www.sixtysymbols.com/

Pretty basic stuff, but I'm jealous of the students taking these professors. 



Oh, and because I'm addicted to parenthases:  ()()()((((())))(

okay... guess not.

makes for odd conversation, Eh? unless its with like minded individuals.

The only motorcycle science I know is that if you don't go fast you fall over.

OR the rubber side
MUST remain in contact with earth for foward motion to continue

Quote from: bubba zanetti on June 30, 2009, 03:54:58 AM
The only motorcycle science I know is that if you don't go fast you fall over.

Quote from: yamahonkawazuki on June 30, 2009, 05:44:08 AM
OR the rubber side
MUST remain in contact with earth for foward motion to continue

Neither of which is true...

That is pretty cool.  The bike sim looks like a great concept but in the test video they had the thing turning right when you turned the bars right and that has me a bit confused.  I hope they have modes because using it in that configuration to test real life scenarios wouldn't be very accurate from an actual motorcycle experience.

As for physics I hear ya, if my professor had been half as interested in his topics and not belittling ever person who asked a question physics would have been a much more fun class.

What a difference the professor makes in the learning process, hunh?

Did anyone else find Archimedes extremely boring?  It's like learning the alphabet again.  Not even vectors to keep it interesting...  Blah!



Interesting, though, that they're trying to have motorcycle ergonomics a dedicated field.  Probably never gonna fly with all the budget cuts going around, but, boy, wouldn't you like to spend a few years at it!
I wonder what the expenditure list is like on their grant proposals. 

Quote from: DoD#i on June 30, 2009, 06:58:45 AM

Quote from: bubba zanetti on June 30, 2009, 03:54:58 AM
The only motorcycle science I know is that if you don't go fast you fall over.

Quote from: yamahonkawazuki on June 30, 2009, 05:44:08 AM
OR the rubber side
MUST remain in contact with earth for foward motion to continue

Neither of which is true...

And wheres your proof.

whats the science dealio behind the 'push left to go left' thing?  that i would like to know.

Quote from: bubba zanetti on June 30, 2009, 03:45:31 PM
And wheres your proof.

Drop by any bike meet with a slow ride contest for the extreme example, more normal examples being the fact that you (well, I anyway) can get into and out of your (or my) driveway without either going fast or falling over, and the fact that I (perhaps not you) can (sometimes, not always) come to a full stop and take off again (as at a stop sign) without putting my feet down. That's yours debunked.

As for Yama's, while you may not continue accelerating when the rubber side is not in contact, forward motion definitely continues, often for quite some distance, depending on speed and what (if anything) is touching the earth. Of course, it often ends in a short sharp, sickening, crunch when something else gets in the way of forward motion.

The physics of countersteering, for LOUiE:
You steer the contact patch out from under the Center of Gravity (CG) of the bike. The bike "falls" in response. You (naturally, unless you crash a lot) allow the bars to come back to center, and the contact patch ends up under the CG of the bike (as adjusted for "mythical but it still works" centrifugal force due to the turn you are now making.) There is probably an additional component from gyroscopic forces due to deflecting the front wheel, which I have not bother to think through, but it likely helps with the "falling into the lean" aspect - but that's a guess from feel, I really haven't bothered to analyze it, as the CG/contact patch covers "why it works" well enough for me. That, and experiment. Experiment does not care about "why" and experiment proves that it works, every time (barring sidecars).

Also this, not too hard to find: http://en.wikipedia.org/wiki/Countersteering

What do you tell the bronze when they pull you over for speeding

Um correct me if my logic is flawed but the push left to go left thing is better explained by the change in the diameter of the tire, ie, if your going straight you are riding on the largest portion of the tread. However, when you turn you are decreasing the diameter of the tire, or the length of the tire. say you put a measuring tape on the peak of the tire and it registers, lets say 50 inches, then you measure the smaller portion of the outside of the tire and it measures 46 inches, that shortened distance along with the lean forces you into that direction. think of pushing a wheel barrel, if you push straight forward it goes forward but pick one handle up and push the other down and the wheelbarrel rides on the outside of the tire, whenyou do this its not going to continue straight it will turn off in the direction you lean because of the shortened path. Also think of rolling a cone. larger diameter on one side and smaller on the other. Roll it and it always goes in one direction, and its not straight... lol Now if you think about it our tires are just two cones glued together in the center. as soon as you lean to one side its gonna take that shortened path.  Make any sense? Maybe, but then again its 1 am....  and Ive been up for 22 hours...

What you're saying is true, Chance.  That does happen.  But DoD's explanation is closer. 
Just combine the two, then figure in the coefficient of friction and apparent direction of either side of the tire.  Vector the circular motion of the patch on either side, as relative to the contact area on the track at the moment of the turn.   

Then, rotational acceleration equation to show why the bike leans in which particular direction.  Just Newtonian physics, all of it. 

Hooray for smart people!  You both win a trophy!  Unattractive girlfriends, ridicule, and a weird sense of humor! 

DOD ive done the stop, no legs down move myself. can be unnerving at times

i like science. but, sadly, my parent's never allowed me to have a chemistry set.....i wonder why???   

Thanks for the trophy .... ummm, wait a minute....

heheheheyyeyeyeye     I broke 400 post... lol damn, about time, I should have started posting in this section a long time ago.. lol

for the record I understood Chanse's better...    its too bad i didn't pay attention in physics class really.  what a shame 

hehe physics was FUN