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Forum index » Science and Technology » Physics » Relativity
Do The Math: Save Gas By Driving Slower
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N:dlzc D:aol T:com (dlzc)
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Joined: 25 Mar 2005
Posts: 2835

PostPosted: Wed Jul 19, 2006 1:52 am    Post subject: Re: Do The Math: Save Gas By Driving Slower Reply with quote

Dear virtualadepts:

<virtualadepts@gmail.com> wrote in message
news:1153195112.216732.205060@p79g2000cwp.googlegroups.com...
Quote:
Work = Force X Distance.

Power = force x velocity

Quote:
So obviously it takes more force

.... Power ...

Quote:
to drive faster in a car, and the same distance
is traveled regardless of how fast you are going.
So if we reduce the speed limits we will save
money and gas!!!!

Not strictly true. An IC engine consumes gasoline even if you
aren't moving. Yes, if you keep your speed 45-60 (depending on
gearing), you'll save some money on gasoline. Likely you'll save
even more if you can keep rolling at constant speed for your
entire trip, even if that is 70 mph (sompared to stop and go).

You'll save even more if you use a hybrid, which only powers the
engine when the batteries get low.

You'll save even more if you don't have 1000+ pounds of metal and
plastic haul your b*tt around.

David A. Smith
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fwd: from Erik
science forum addict


Joined: 13 Oct 2005
Posts: 97

PostPosted: Tue Jul 18, 2006 5:38 pm    Post subject: Re: Do The Math: Save Gas By Driving Slower Reply with quote

On Tue, 18 Jul 2006 10:13:07 GMT, "Dirk Van de moortel"
<dirkvandemoortel@ThankS-NO-SperM.hotmail.com> wrote:

Quote:

virtualadepts@gmail.com> wrote in message news:1153195112.216732.205060@p79g2000cwp.googlegroups.com...
Work = Force X Distance. So obviously it takes more force to drive
faster in a car, and the same distance is traveled regardless of how
fast you are going. So if we reduce the speed limits we will save money
and gas!!!!


[Hammond]
.... according to your theory if you go 30 instead of 60 you
will use HALF AS MUCH GAS to go the same distance...
...........any IMBECILE knows that's NOT true!


Fact is the "rolling resistance" of a car is nearly
independent of the speed (due mainly to the soft tires)..
it is only because "air resistance (which only
amounts to something at high speeds) increases as
the square of the car's speed that there is any
(marginal) difference in mileage at any speed.
========================================
SCIENTIFIC PROOF OF GOD WEBSITE
http://geocities.com/scientific_proof_of_god
mirror site:
http://proof-of-god.freewebsitehosting.com
========================================
Fact is, gas mileage only MARGINALLY decreases with
speed............. mainly because "wind resistance"
is a quadratic function of the cars velocity.... but the
fundamental "rolling resistance" of the car is
virtually independent of speed.
========================================
SCIENTIFIC PROOF OF GOD WEBSITE
http://geocities.com/scientific_proof_of_god
mirror site:
http://proof-of-god.freewebsitehosting.com
========================================
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Dirk Van de moortel
science forum Guru


Joined: 01 May 2005
Posts: 3019

PostPosted: Tue Jul 18, 2006 10:13 am    Post subject: Re: Do The Math: Save Gas By Driving Slower Reply with quote

<virtualadepts@gmail.com> wrote in message news:1153195112.216732.205060@p79g2000cwp.googlegroups.com...
Quote:
Work = Force X Distance. So obviously it takes more force to drive
faster in a car, and the same distance is traveled regardless of how
fast you are going. So if we reduce the speed limits we will save money
and gas!!!!

Yes, provided we introduce a minimum speed as well.
See also
http://auto.howstuffworks.com/question477.htm

Dirk Vdm
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virtualadepts@gmail.com
science forum beginner


Joined: 19 Feb 2006
Posts: 18

PostPosted: Tue Jul 18, 2006 3:58 am    Post subject: Do The Math: Save Gas By Driving Slower Reply with quote

Work = Force X Distance. So obviously it takes more force to drive
faster in a car, and the same distance is traveled regardless of how
fast you are going. So if we reduce the speed limits we will save money
and gas!!!!
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