Help With Science Fair??

Postby biker21 on Wed 10/Jun/09 6:08pm

hi guys, me and my mate have a science fair comming up, which is due in on Friday.

we have decided to do it on " how mountain bike gears work ", as in, how it gets harder to pedal when the gears are shifted.
if anybody could explain how this heppens that would be great, Thanks

Zach
biker21
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Re: Help With Science Fair??

Postby Wobbler on Wed 10/Jun/09 6:13pm

do you want us to make you a poster also? or is just a report okay?
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Re: Help With Science Fair??

Postby XCrazy on Wed 10/Jun/09 6:17pm

I don't mean this to come out overly harsh but I believe the idea of a science fair is you do some research as opposed to just asking for the answer to your question straight up. Google is an amazing tool to start with.

http://en.wikipedia.org/wiki/Gear
http://en.wikipedia.org/wiki/Gear_ratio
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"WWJD...... What Would Jens Do?"
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Re: Help With Science Fair??

Postby znomit on Wed 10/Jun/09 6:18pm

Isn't it obvious/simple?
Image

Image

With one day to go, and in a panic, I would put a weight on the pedal and see what it will lift at the back of the rear wheel.
Repeat for all gears.
Discuss.
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Re: Help With Science Fair??

Postby happybaboon on Wed 10/Jun/09 6:26pm

Or pedal at 100% effort in each gear for a set distance and then do a skiddd until you stop. Measure how long the skiddz are using each gear. That's science for you. Science is all about doing some epic skydz.
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Re: Help With Science Fair??

Postby znomit on Wed 10/Jun/09 6:28pm

happybaboon wrote:Science is all about doing some epic skydz.

Usually around exam time. Or when I realise a project is due in 2 days and I haven't even started.
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Re: Help With Science Fair??

Postby Joshguy01 on Wed 10/Jun/09 6:34pm

Just do a bloody volcano like all the other kids.
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Re: Help With Science Fair??

Postby biker21 on Wed 10/Jun/09 6:44pm

if anyone can do a poster that would be kool.

nah volcanoes arnt cool
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Re: Help With Science Fair??

Postby XCrazy on Wed 10/Jun/09 6:45pm

Hang on.... you want us to do a poster? Whos science fair is this? :eh:
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Re: Help With Science Fair??

Postby dicks-naughty-account on Wed 10/Jun/09 6:46pm

Its due on Friday... and you left it 'til Wednesday night. Well done :lol:
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Re: Help With Science Fair??

Postby Muz on Wed 10/Jun/09 6:47pm

XCrazy wrote:Hang on.... you want us to do a poster? Whos science fair is this? :eh:


:D You didn't realise that he wants others to do his work for him.... ??? :thumbsup: :D
(I'll give him credit for asking...if someone's dumb enough, even more credit for conning someone to do his work...)
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Re: Help With Science Fair??

Postby Joshguy01 on Wed 10/Jun/09 6:47pm

biker21 wrote:if anyone can do a poster that would be kool.

nah volcanoes arnt cool


OMG SRSLY?!?!1!
Personally I wouldn't have said a rushjob entry was all that cool either... :huh:
Last edited by Joshguy01 on Wed 10/Jun/09 9:17pm, edited 1 time in total.
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Re: Help With Science Fair??

Postby biker21 on Wed 10/Jun/09 6:49pm

cmon guys!! we gotta work as a team here, together, we can do it!
biker21
Member for: 10 years 9 months

Re: Help With Science Fair??

Postby XCrazy on Wed 10/Jun/09 6:50pm

Muz wrote:
XCrazy wrote:Hang on.... you want us to do a poster? Whos science fair is this? :eh:


:D You didn't realise that he wants others to do his work for him.... ??? :thumbsup: :D
(I'll give him credit for asking...if someone's dumb enough, even more credit for conning someone to do his work...)

Well I suspected after the first post but wasn't quite prepared for blatant outright asking :huh:
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Re: Help With Science Fair??

Postby michael on Wed 10/Jun/09 6:52pm

Devide the number of teeth on the front by the number of teeth on the rear, times by the circumference of the wheel (2pi*r), this tells you how far the bike travels for each turn of the cranks.

Make a big graph that shows each of the ratios. Probably best shown as a sideways bar graph.

explain how that when you shift into harder gears you have to travel further for the same crank rotation, so it requires more effort.

Done!

Not much of a science project, wheres your hypothesis? back in my day I had to grow germs off money and stuff.
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