i figured out where galileo went wrong on friction being independent of surface

[raaaid]

i call it the law of the 3 points of contact fro rigid objects

galileo, amonton and coulomb verified in practice it made no difference the necesary force to move a box on different size contact surface

well this is due to the law of the 3 point of contact

any rigid object will not be perfect bu wavy so there will be just 3 points of contact however much apparent surface

but this is false for soft objects as tyres in which the 3 points of contact law is not valid and the force to move the object is proportional to the contact surface

[pstyle]

why don't you spend some time working on the one with the propeller aircraft and the moving runway?

[Outlaw]

Originally Posted by raaaid

i call it the law of the 3 points of contact fro rigid objects

galileo, amonton and coulomb verified in practice it made no difference the necesary force to move a box on different size contact surface

well this is due to the law of the 3 point of contact

any rigid object will not be perfect bu wavy so there will be just 3 points of contact however much apparent surface

but this is false for soft objects as tyres in which the 3 points of contact law is not valid and the force to move the object is proportional to the contact surface

Wow, you're a GENIUS!!!!!!!

You've just "discovered" what has been known for hundreds of years and can easily be found on the Internet.

I just hope that one day we can all break free from the matrix and be as smart as you.

Are you, "the one"??!?!?!?!?!?!?!? Please free us!!!!

--Outlaw.

[raaaid]

Originally Posted by pstyle

why don't you spend some time working on the one with the propeller aircraft and the moving runway?

you mean this?

http://www.youtube.com/watch?v=4pgDs50A-Yw

edit:

i wont discuss that outlaw but then friction is surface INDEPENDENT for rigid objects as boxes and surface DEPENDANT for soft objects like tyres

so actually the right answer for my question:

is frictiion surface dependant?

the right answer is yes and no

edit:

otlaw your so gonna love this:

if i google:

3 point of contact friction

this thread makes it 7th of 5.400.000

so either google has me on high steem or this is not such widely known idea

[Sternjaeger II]

YOU ARE BACK?!?!

[raaaid]

haha ive just had a physics exam and one of the questions was sliding friction, i didnt mention the law of the 3 points of contact though so after 10 years im pretty sure finally im passing physics

[Screamadelica]

Excellent. Snoopy and the Red Baron are back in action. Time for some more entertainment.

[swiss]

[Ze-Jamz]

Originally Posted by swiss

HaHa...brilliant

[Screamadelica]

HaHa... excellent! Keep 'em coming.