[Gasification] OT, now, Boat pulls easier than Cart?

[Henri Naths]

GF.. If you triangulate the energy it take to lift the limp mooring ropes, and I assume there were more than one, that energy would be more than a one pound force..
H.
  ----- Original Message ----- 
  From: GF 
  To: gasification at lists.bioenergylists.org 
  Sent: Thursday, May 26, 2011 4:54 PM
  Subject: Re: [Gasification] OT, now, Boat pulls easier than Cart?


  There is of course greater friction when moving an object through  fluids of  greater density, However a boat, sitting in a fluid at rest, will move, if pushed by even the slightest force. This would also apply if ball bearings were perfectly round. because their surfaces would not touch the race,due to the principle that it is impossible for a perfect sphere to touch a perfectly smooth surface as the point of contact is infinite.
  Having said that. one early morning I happened upon a moored 100 ton barge loaded with coal floating in the canal  which had a looking glass surface, the mooring ropes were limp, the barge was totally at rest as was the air and the water surrounding it. I applied force with my little finger not more than 1lb. to see if it would move, nothing happened at first but then the barge began to move in the direction it was being pushed, I just cannot see a vehicle other than a vessel moving with such a small force being applied.

  GF



   -----Original Message-----
  From: Pete & Sheri <spaco at baldwin-telecom.net>
  To: 'Discussion of biomass pyrolysis and gasification' <gasification at lists.bioenergylists.org>
  Sent: Thu, May 26, 2011 12:48 pm
  Subject: Re: [Gasification] OT, now, Boat pulls easier than Cart?


I'm sorry, but I disagree with your comments that the cart would have more
friction than the boat,  loaded or
Not.  The density of water vs air has a lot to do with it.  But the two main
friction sources to compare would be water friction vs bearing and
wheel-to-surface friction of the vehicle.  I'd agree with you if the cart
had no wheels and had to be dragged down the road as the boat has to be
dragged in the water, but this is not the case.

In the history of west in the USA, people used sails on "covered wagons" for
motive power.  They worked okay as long as there were relatively smooth
surfaces to run them on.

Google this:
http://en.wikipedia.org/wiki/Land_sailing

Pete Stanaitis
-----------------

-----Original Message-----
From: gasification-bounces at lists.bioenergylists.org
[mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Anand
Karve
Sent: Thursday, May 26, 2011 10:57 AM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] Underwater gasification?

Dear Henri,
you have misunderstood me. I said that hauling a boat floating in
water was easier than pulling a cart on land.  I was comparing the
friction of the boat with water with the friction of a loaded cart on
land. The density of air and water have nothing to do with it.  I
mentioned air only as a motive force. Wind can move a boat easily
through water but the wind of the same velocity would be unable to
move a cart on a road.
Yours
A.D.Karve





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