friction and mu!?

[Josh_gsy]

i was having a chat with mates last night about mu i still do not what it is. something about friction i think.

 

but yea so what im wandering is if the world was frictionless, the following things....

 

1) would a bullet shot from a gun be slowed down by air resistance?

 

2) would fans work?

[Messenjah]

if there was no frictiont hen that answer would be no to both ...

[richie_stix]

damn you messenjah... i wanted to look smart!

[Josh_gsy]

so im right in saying wind resistance is the friction of the air moving over the object? what about the air has it to displace if you imagine each particle as a solid it would have them bouncing off of it at the same angle it hit so if an air particle hits it head on it would try and add a force in the oposite direction slowing it down??

and as for a fan would it create any wind movement as if you imagine each particle as a solid surely they would bounce away from the fan at the same angle it hits it at as it spins?

 

or am i just trying to over complicate things!?

[richie_stix]

no, your on the right track... but air behaves more like a liquid...

 

so imagine a fan like a propellor on a boat and the 'air resistance' is like the difference between a big flat fronted boat and a speed boat...

 

but the difference with air is varies in pressure a lot more than a liquid, liquids tend to ahve to be heated to get pressure in them...

 

so as you were saying about the solid particles of air bouncing off all in the same direction... it doesn't happen cos air particles rush to fill in lower pressured areas, such as under a diffuser, which mean they don't all go the same way but create 'turbulance'...

 

any clearer, that was some quite retarded explanation by me!

[bortaf]

Please no lets not get into fluid dynamics

[richie_stix]

so im right in saying wind resistance is the friction of the air moving over the object? what about the air has it to displace if you imagine each particle as a solid it would have them bouncing off of it at the same angle it hit so if an air particle hits it head on it would try and add a force in the oposite direction slowing it down??

and as for a fan would it create any wind movement as if you imagine each particle as a solid surely they would bounce away from the fan at the same angle it hits it at as it spins?

 

or am i just trying to over complicate things!?

 

just read this through again, and yeah you are right bout the wind resistance... hence proper race cars are polished loads so they are smoother through the air ie quicker

 

and the other stuff is a very simplistic way of looking at it, rather than over complicating things!

 

peace

[X-pack-Glyn]

Fluid dynamics , notice how the chimps piss hits the walls and bounces off.

[Josh_gsy]

cheers i think i got the basis of this now cheers

[bortaf]

so im right in saying wind resistance is the friction of the air moving over the object? what about the air has it to displace if you imagine each particle as a solid it would have them bouncing off of it at the same angle it hit so if an air particle hits it head on it would try and add a force in the oposite direction slowing it down??

and as for a fan would it create any wind movement as if you imagine each particle as a solid surely they would bounce away from the fan at the same angle it hits it at as it spins?

 

or am i just trying to over complicate things!?

 

just read this through again, and yeah you are right bout the wind resistance... hence proper race cars are polished loads so they are smoother through the air ie quicker

 

and the other stuff is a very simplistic way of looking at it, rather than over complicating things!

 

peace

 

Golf balls are dimpled top trap small pockets of air that reduces surface friction and makes em fly further, i allways wanted to dent the hell out of a car and try a top speed run to see if it was higher afetr a good "dimpling"

A small ball ended hammer would do

[5hane]

hence proper race cars are polished loads so they are smoother through the air ie quicker

and bob sleghs there very shiny

[X-pack-Glyn]

hence proper race cars are polished loads so they are smoother through the air ie quicker

and bob sleghs there very shiny

 

And bellends

[bortaf]

Depends how often you "polish" em i guess

 

can i just say "flange" again

 

 

only cos i think it's funny like