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Im doing a project, in which i can choose ANYTHING related to chemistry or physics and give a presentation on it. I was thinking somehow incoorperating suspension geometry into physics. Also, Id get to give a presentation on what I love most. Also, alot of people i know have a very skewed percetion of what mountain biking is; that we go and buy toy's R Us bikes, and ride paved paths, this would serve as a chance to prove those critics wrong as well. Any Ideas/Thoughts w/e would be greatly appreciated.
Thanks alot
 

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What about bob?

edray said:
Im doing a project, in which i can choose ANYTHING related to chemistry or physics and give a presentation on it. I was thinking somehow incoorperating suspension geometry into physics. Also, Id get to give a presentation on what I love most. Also, alot of people i know have a very skewed percetion of what mountain biking is; that we go and buy toy's R Us bikes, and ride paved paths, this would serve as a chance to prove those critics wrong as well. Any Ideas/Thoughts w/e would be greatly appreciated.
Thanks alot
How 'bout a discussion of an age-old question in FS designs: How to prevent bob. You could talk about various designs and technologies (4-bar, Horst, single pivot, inertia valves) and describe the physics involved in each, and some pros and cons. Problems like brake jack, pedal feedback, power loss, loss of power transfer, etc.

I always found that a good approach in doing presentations (at least in high school) was to go over the teacher's head. Nobody wants to look stupid, so they end up giving you an A because they don't want to admit they have no idea what you're talking about. I once did a presentation on Extropianism. What is Extropianism, you ask? No idea. Nobody asked any questions afterwards. I got an A.
 

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Maybe limit it to the front of the bike. You could talk about the compressive forces needed to overcome friction (stiction) inducing the fork to compress. You could discuss how oil viscosity affects the speed of compression. Then you could talk about how the resulting changes in front end height affect steering.

Ohhhh, Better yet. Discuss how a suspension fork reduces forces of impact on the head-tube. You could probably find data to determine how much force (how big a drop per rider weight) is needed to shear the head-tube off or crack a downtube etc. Then figure out how big a fork you'd need to safely ride the drop.

OR. Go the chemistry route and discuss the endorphin rush that result from the drop described above.

Man, there's tons of great topics to be had there. Use your imagination.
 

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dir-T said:
Ohhhh, Better yet. Discuss how a suspension fork reduces forces of impact on the head-tube. You could probably find data to determine how much force (how big a drop per rider weight) is needed to shear the head-tube off or crack a downtube etc. Then figure out how big a fork you'd need to safely ride the drop.QUOTE]

Do that one! You could find some dumb clyde willing to do big drops on a sid fork and video it. You'd have a great visual aid. :D

Seriously, that would be a cool topic.
 

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You oughtta see some of the physics discussions that have taken place on the 29er board. Under which conditions is a 29er better than a 26er, or vice versa? There is plenty of meat here; angles of attack, inertial mass, center of gravity differences due to bottom bracket drop, fork rake, trail, contact patch, yada yada yada...
 

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How about: Effects of rotating mass, i.e. heavier tires, wheels, etc (could translate over to cars too, was an story at edmunds.com about that). You could explain the differences between 26 and 29 inch bikes in scientific terms.
 

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You could talk about rolling resistance associated with tire size, air pressure, tread design, and the affects on speed in different conditions and traction (gription, as I like to call it). The air pressure to rolling resistance could also be related to cars and gas mileage, and how much fuel could be saved by increasing air pressure and narrowing tires.
 
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