Anonymous asked in Science & MathematicsPhysics · 1 decade ago

Oh it's too hard....?

During a fuel-economy test of a sports car, the car achieved more miles per gallon of gasoline when its convertible top was up. How is the convertible top being up or down related to the car's fuel economy?

Can anyone solve this question?.....

5 Answers

  • 1 decade ago
    Favorite Answer

    When the top is down, it creates more air drag which creates a force that is opposite of the car's motion. Therefore, more energy is required in order to keep the car moving at the same speed.

  • Anonymous
    1 decade ago

    You get a much smoother airflow over the car when the top is up. With the top down, the windshield acts as a spoiler and creates lots of turbulence, at a considerable cost in energy. For the same reason, you are better off driving with the windows up and the A/C running on a warm day.

  • 1 decade ago

    When a convertible top is doun the car lose its aerodynamic shape. So there is more drag from air, you can feel it like a vacuum wen you are driving it. There are some upgrades in design to prevent this on some vvehicles.

  • Anonymous
    1 decade ago

    Of course, simple common sense.

    With the top down there is a lot of air turbulence in the car - you know this because a person's hair is always blowing around when a top is down.

    Turbulence means friction, which means drag (slowing down) on the vehicle.

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  • 1 decade ago

    maybe it its more aerodynamic with the top up

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