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**Aryan** · 11-25-2009, 10:43 AM

General Biking Discussion Approved.

**augusta** · 11-25-2009, 10:55 AM

This is my guess :
A centrifugal force is the force that forces a body to move inwards(towards the centre) while in a curve. It is denoted by F=m*v*v\r where 'm' is the mass of the body, 'v' is the velocity and 'r' is the radius from the centre. So according to mathematics, 'r' is inversely proportional to 'F'. So if you increase the radius, which means if you are a bit far from the centre, force decreases and chances of falling off are less. Hence even some roads are slightly raised from the outer sides.
This may be the reason or may not be...I guess there are other factors too, which some seniors can explain.

**rx100.7050** · 11-25-2009, 11:00 AM

ok... explanation from a very "non tech" guy

When cornering, the bike tends to move away from the centre..right? But we lean so as to counter this movement & I guess that's why it doesn't fall. If you reduce speed & don't come up straight you will fall

BY GOD kya funda lagaya mainey!!

**augusta** · 11-25-2009, 11:05 AM

Originally posted by rx100.7050

When cornering, the bike tends to move away from the centre..right?

No, I guess this is wrong. The machine(any vehicle) move towards the center due to centripetal force. We lean to further increase speed but eventually if we lean real low, the radius too decreases and hence force increases, and the machine crashes.

**Nitin_traveller** · 11-25-2009, 11:05 AM

this is the same concept of earth cornering around sun

..

if you are falling(read leaning) towards a corner but your falling is such as, when you are suppose to kiss the corner (read tarmac), the corner is not there (read because this is a turn stupid.. ).. then you would lean but not fall.. physicist also called it some phenomenon (I think something like projectile..)

obviously all the forces should be in perfect balance.. speed should be good enough, which takes you to turn before falling on tarmac.. leaning+speed in perfect angle.. and Friction plays an important force in them.. (read take care of your tyre tread..)

thanks for reading to my great theories

..

**rx100.7050** · 11-25-2009, 11:09 AM

Originally posted by augusta View Post

No, I guess this is wrong. The machine(any vehicle) move towards the center due to centripetal force. We lean to further increase speed but eventually if we lean real low, the radius too decreases and hence force increases, and the machine crashes.

Sorry to ask

but isn't it the same thing when we try to rotate a ball attached with a string to a stick?? It tends to move away, right? It can't coz of the thread? Just a question dear.... trying to understand not debate

**augusta** · 11-25-2009, 11:14 AM

Now even I am confused

...
an object will move outwards while trying to rotate along an axis...but we lean to move in and stay on the road..but if we move real in..we fall. I guess you are right

Its a discussion..everyone is learning and understanding.

**amandeepkamboj19** · 11-25-2009, 11:26 AM

HUUUUMMM not simple english but in technical term,

when body moves along circular path a force called centipital force acts on it in outward direction( this is because stuntmen do not fall in MAUT KA KUAN).

Now three forces are acting one is centipital force and another is you weight which is acting in downward direction due to gravitational, and reaction force.

now follow the attached photos bellow

proud to be a mechanical engg

**ravisanjeevk** · 11-25-2009, 12:54 PM

Physics is applied when turns are designed for roads. You might want to learn about Banking. Banking is defined as raising the outer edge of the road in order to negotiate the curve.

Check this link which has information wcih explain the above concept.
Physics Tutorial: Banked Curves

**Old Fox** · 11-25-2009, 01:17 PM

Originally posted by pulsater View Post

why bikes doesn't fall while cornering?
any answers (in simple english)?

@ Pulsater: Good to see your post after a long time. Going by your location note, good 'ol Lucknow would be a trifle lonely without you eh!

augusta, amandeep: He asked for 'simple English'!! Since when did mv2/r qualify as simple English

.

To make amends, I'll confine my answer purely to text. Would need your visualization skills to be active though to understand it.

why bikes don't fall while cornering?

**rx100.7050** · 11-25-2009, 01:20 PM

Originally posted by Old Fox View Post

@ Pulsater: Good to see your post after a long time. Going by your location note, good 'ol Lucknow would be a trifle lonely without you eh!

augusta, amandeep: He asked for 'simple English'!! Since when did mv2/r qualify as simple English

.

To make amends, I'll confine my answer purely to text. Would need your visualization skills to be active though to understand it.

why bikes don't fall while cornering?

I knew it you would be posting your reply & I was eagerly waiting for it, Sir.

btw I was kinda correct. YIPPIE

**rachitkohli** · 11-25-2009, 01:27 PM

@old_fox.. vow finally a detailed explanation from the master of physics..!

one more thing, Isn't the 'Banking of Road' plays a role in corners. If there is not banking an object will be thrown tangentially.

**kurtrules** · 11-25-2009, 02:47 PM

Well put OF!

The next question that comes to the mind is "Cases in which the rider would most definately fall while negotiating a curve"

**dcs** · 11-25-2009, 03:02 PM

One bloody Stupid answer (an obvious one too) in response to Kurt's Question:

1. If the tyres run flat.
2. If the road ends before the end of the curve.
3. If there is some Dog, Cat, Cow, Goat, elephant, Horse, Tiger, Mud, Slush., Oil, water, Pothole on the curve itself.

Ok, that was on the funnier side, for a serious answer, please wait for Old Fox to post!!!

peace!

dcs

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Why bikes dont fall while cornering?

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