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Special Report, Travel, Americas
#1
Asphalt is made of the heavy oils left behind after the lighter oils in crude petroleum have evaporated. The result of this evaporation is a sludgy material that's solid at room temperature but liquefies with little heat. Asphalt doesn't have a melting point, but at temperatures of over 100 degrees Fahrenheit, it will begin to behave more like a liquid than a solid. These temperatures are easily reached during a race thanks to the forces of friction. When a NASCAR tire moves across a track's surface, it does so through applied force in the form of torque from the car's engine. This applied force pushes the car forward while the rolling friction pushes in the opposite direction. As a result of this friction, heat builds up, decreasing the asphalt's viscosity and making it more liquid than solid. This makes the track feel oily and slick and can make it difficult to handle, especially at the corners (one reason why the corners at Martinsville Speedway are concrete while the rest of the track is asphalt).




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