Re: Name that force

[Kari Uolevi Eloranta <kariuolevi@NETSCAPE.NET>]

kowalskil@mail.montclair.edu wrote:

> Consider two kinds of "rain," one in which droplets
> are made of water and another in which droplets
> are made of honey. The rate at which the mass in
> the car increases (uniformly over the entire surface)
> is the same. Do you expect the rates of slowing down
> be different for these two rains?
> Ludwik Kowalski
>
> On Tuesday, Oct 28, 2003, at 06:50 US/Pacific, Kari Uolevi Eloranta
> wrote:
>
> > I think the viscosity of water plays a role  in acceleration, also. So,
> > for the total effect, you have to consider both the viscosity and
> > interactions with
> > the walls.
> >
> > Terveisin, Kari Eloranta, Finland
> >
> >
> > britton@ncssm.edu wrote:
> >
> > > The force is the impact of each raindrop that hits the BACK wall of
> > > the car or the FRONT of the FRONT wall of the car.
> > >
> > > Relative velocity of the drops is slanted backwards, from the car's
> > > point of view. . . .
Well, to be honest, yes I would. If I consider a single droplet, it
takes time
to accelerate it in horizontal direction. Honey is stickier, so greater
force
is excerted on a honey droplet than on a water droplet thus causing greater
acceleration. Final situation remains the same in both cases (honey,
water),
but processess are different in their rates.

Could you please explain to me what is wrong in my reasoning. Probably
I am just missing here something obvious, but I just cannot see it.

Best regards, Kari Eloranta