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Re: oh well!(kaboom) - a boring excursion into physics of KinematicMotion
Because of conservation of energy laws and the restrictions, namely no
friction the car would be propelled a lot further that 40 miles on 1 cup of
fuel. The distance it would be propelled is infinite if frictional forces
are not taken into account, Newton's law. While if the gasoline is placed
below the car all of the arguments Igor provided are accurate. So a car
being propelled up in the presence of a gravitational field can not be
compared with a car moving in a straight line because no friction forces are
acting on the car.
From: four.rings@MCIONE.com <four.rings@MCIONE.com>
To: Q-list <email@example.com>
Date: Friday, July 24, 1998 8:38 AM
Subject: RE: oh well!(kaboom) - a boring excursion into physics of
>>From the previous discussion:
>>>I seem to remember reading that 1 cup of gas at the proper air/fuel ratio
>>>will lift one ton 1,000 feet...people just _don't_ realize how dangerous
>>>gas and gas vapor is...
>>Actually, this sounds a bit low to me ... after all, one gallon of gas
>>propel one ton of car 40 miles or more! ;^)
>[end of previous discussion]
>>That's not a valid comparison; one involves changing the object's
>>energy(basically, its height*mass.) The other is changing its velocity,
>>which requires an initial change in kinetic energy(velocity*mass) and then
>>countering air, rolling, and mechanical(engine/drivetrain) friction.
>Mmm, wrong on several accounts.
>One of the Conservation Laws states that Energy does not emerge or
>rather convert from Potential into Kinetic and back.