November 13, 2006 at 4:04 pm | | wild web

I wish I had taken this one:



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  1. what about or you’re bound to get some traffic based on typos there, lol. you should find a very popular chem blog, and snatch a domain that is a common misspelling of it.

    Comment by anon — November 13, 2006 #

  2. EDS is a very popular chem blog. [/sarcasm]

    Comment by sam — November 13, 2006 #

  3. To whom this may concern,

    I have this one question that I would like to ask if it is appropriate.

    Does mass affect the speed of the car when you travel at very high speed? Say you have two identical cars (same shape) with the same horse power. One is 3 times heavier than the other. Both cars are to speed up to their maximum speed in an infinite wind tunnel. My question is that would the heavier car reach a higher maximum speed than the lighter car, if you take into consideration of the wind resistant and the drag force, and the momentum.

    My belief is that in an ideal world, in the case above, the lighter car will have 3 times the maximum speed of the heavier car. But because in real world, in this case the wind tunnel. Would the weight of the car have any effect on the maximum speed that the car can reach? I thought the lighter car would be more sensitive and resistible to the wind resistant, and when it comes to a certain point, the amount of thrust that you put in will be compensated by the opposing wind resistant, and eventually the accelleration will approach zero (terminal velocity). And because the heavier car has a larger momentum, would this be an advantage to the overall speed? And that it requires more force to cancel out the amount of thrust that you put in. That is a higher wind-speed (equivalant to faster car speed) than the other’s to reach the point where the thrust will be cancelled out by the opposing wind-resistant. Therefore the speed for the heavier car to reach this limit would be higher than the lighter car? That is the heavier car’s terminal velocity is higher than the lighter car’s. Given that a the same amount of force is constantly applied to both cars.

    This question comes about when I play a car racing simulation game called Forza Motorsports. What I have noticed from that game is that with the same horse power cars, when you reduce the weight of the car. Its accelleration factor increases but its maximum speed factor degrades by some amount. I am just being curious why this is the case? Could the simulation be wrong?

    Could you spend sometimes to explain all the factors,facts, and physics theories behind this?

    Your time is greatly appriciated.


    Kind Regards

    Dan Le

    Comment by Dan LE — October 31, 2007 #

  4. Dan, a game is a game.
    F=ma. Given the same force, a more massive object will have a smaller acceleration.
    The maximum velocity of an object is when the opposing forces match the forward force and the acceleration equals zero.
    Air-resistance does not depend on mass, but on shape/size. Two identically shaped/sized objects should have the same air resistance at a given velocity.
    So, the lighter car should accelerate more, but it will have the same maximum velocity as the heavier car.

    Comment by sam — November 1, 2007 #

  5. Hey Dan Le

    Glad you got a reply, because I am till trying to get my head around it. Made me think anyhow.


    Comment by paint protection — November 12, 2007 #

  6. I already got one – ;)

    Comment by — November 30, 2007 #

  7. Hey Sam what about ?

    Comment by D Legal — April 10, 2008 #

  8. That really is the best website name. ;-)

    Comment by NO1 — April 4, 2009 #

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