Dr. Manhattan
Dan Fajans Lyrics

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Mike Diaz A la vista un humilde veterano del Vodevil Mostrado erronea…

We have lyrics for these tracks by Dan Fajans:

Pay Attention Everything but The one thing knocking on the door The one th…

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Most interesting comment from YouTube:

Dude On Bike

I'll challenge your assertion.

A track stand doesn't utilize a bicycle's geometric stability characteristics to stay up. All a track stand is is moving the bike back and forth laterally to prevent a lateral fall (or to the side). I can track stand all day long. And ride backwards reasonably well - even on a tandem. (I also ride unicycle, but that's another matter completely.)

A track stand requires the front wheel to be angled at a very sharp degree. I haven't measured it, but it's VERY steep. I'd even go as far as saying the track-stand angle is too steep to be able to ride. No way you can ride "normally" at such a sharp angle. Now you could circle probably, but not "ride" in the traditional sense.

Also, track standing doesn't involve countersteering at all. The front wheel is simply turned so far to the side that forward action on the pedal moves the bike more sideways underneath you than forward. I trackstand pointed left (convenient for two reasons: 1. I'm left-handed and dominant and 2. Left means UP the crown of a typical US road, so the bike can coast "right" by letting off pedal pressure) so when I start to fall left, I pedal forward, moving the bike to the left underneath me. When I start to fall right, I let off pedal pressure and the bike rolls backwards and to the right, catching my fall to the right. (Obviously not a fixed gear, so I cannot "push" the bike backwards, thus the aid of a hill. That said, I can actually "push" myself back. I do this with the brakes. I hold the brakes, then push my body back, then release the brakes. My body's momentum pulls the bike back. Voila! Track stands on level ground.) This is how a track stand works and is separate from normal bicycle riding dynamics.

And to your second point, rollers rely on bicycle frame geometry just as the road does; there's no difference. What makes rollers so challenging is the tiny and curved contact surface. Riding them takes practice, but with it, you can ride no hands just like on the street.

I don't mean to be a jerk. Actually, I'd like to thank you for your post because it made me analyze some riding technique I hadn't really thought about in such detail.

All comments from YouTube:

Dude On Bike

"Roll on You Bears!"

Thank you so much Professor Fajans! I've referred to your lecture many, many times in the past. In fact, I even got on NPR's Science Friday to challenge one guest's assertion that the gyroscopic effect is responsible for a bike's steering. All thanks to your lecture about 10 years ago!

Go Bears!

PS I took classes in this very lecture hall. And I lucked into having a lecture end one day when a group of people were gathering outside the doors and obviously waiting excitedly to get in for the next lecture. I asked what all the hubbub was about and someone said, "Professor Lee from China is here to present his breakthrough work on cold fusion!" I stayed. Turns out his work wasn't as revolutionary as expected and cold fusion is still "about ten years away!"

Alan M

I enjoyed your video on bicycle physics ! I agree with your statement that you never have to turn your wheel (bars) in the "proper direction". However, it is also true that you never have to turn your bars in the undesired direction. Since we are living in a gravitational field, we can just allow our bikes to fall over towards the side we wish to turn into. This likely requires a slight weight imbalance and you have to "catch" the bike at the desired angle. I have recently been doing this and it takes a willingness to just let yourself start falling, but it can be done. I start by concentrating on keeping the bike and wheel in the same plane so I am falling instead of steering. It is a interesting feeling to let yourself fall and then continue on.
Instead of telling people to test counter steering one handed, I suggest telling them to exert a slight force on one side of the handlebars. That allows one to keep both hands on the wheel for safety while learning about counter steering.
There are all kinds of ways to make your bike do what you want. I have no problem riding no hands while using my weight and applying force on a pedal to make my front wheel make violent transverse movements even while turning. The front wheel points to one side and then rapidly turns to the other.
Regarding the demonstration where the bike is up against a board symbolizing a curb: You don't have to counter steer. Just start a fall away from the curb to circle away from it. It's a good way to avoid some idiot in a car that suddenly throws his door open and it lets you circle around to cuss him out! You do need to know if you have a clear path, of course.

David Perry

6y↑1

Centrifugal force and centripital force are two different things. One applies outward the other inward.

OC Shot

5y↑1

I disagree somewhat. Although a centrifugal force (although fictional) certainly exists and affects balance when riding a bike, it is only part of all that's happening in keeping a bike upright. For instance, a rider can keep upright while on a track stand, maintaining balance by making minute body adjustments, much like standing on one's feet or an inverted pendulum, to keep his center of gravity aligned while waiting for the opponent to make the first move. Track cyclists can do this for a reasonable length of time with little to no displacement. Although a fixed-gear bike helps, the same feat can be attained with a regular bike, although some bike displacement might be needed. Another instance is while riding on rollers. There is no translational displacement when riding rollers, so centrifugal force cannot affect balance. It must, therefore, be attained again by the rider's skill in keeping his/her center of gravity aligned and perhaps benefiting from angular momentum.