# Does drag coefficient change with speed?

• Bernice Teo Property
It depends on the velocity of the flow, the surface area of the body, and the characteristics of the surface. ... For all the velocities, the drag coefficient of the position with the arms extended at the front was lower than the drag coefficient of the position with the arms along the trunk.
• ### Is downforce good or bad?

Downforce can certainly make your car more stable, but when you are going for sheer speed, downforce can actually be a hindrance. Any increase in downforce also means an increase in drag. This is why many sportscars with deployable wings not only deploy those wings at high speed but also during braking.14 sept 2018
• ### Are heavier bikes faster downhill?

No. Galileo proved that all objects, regardless of weight, fall at the same rate. In physics terms, the acceleration due to gravity is a constant. Since gravity is what propels riders going downhill, its effect on riders is the same regardless of the rider's weight.
• ### Is a polished car faster?

This look that would take some getting used to. This is just clay. A polished car will be marginally more efficient than a car with a rough surface, but a dimpled car (like a golfball) will add MUCH more efficiency than polishing, as Mythbusters found. This look that would take some getting used to.
• ### What do splitter rods do?

A car splitter acts like a wedge that forces the high pressure air upwards where it builds up around the bumper and migrates up and over the car. The high speed, low pressure air passes underneath the car.27 oct 2016
• ### Does more drag mean more fuel consumption?

This means that at freeway speeds the frictional drag is no longer the main gas guzzler – aerodynamic drag will now account for more half of the fuel you're using, or even more. The faster you go, the more fuel you use pushing your car through the air.