In_The_Wet_Quiz.pdf

Transcript

1. In the Wet Quiz
2. What are some of the reasons racing in the wet is more challenging? • A) The coefficient of friction is higher and the visibility is reduced • B) Water can get in the cockpit leading to an overall uncomfortable driving experience. • C)Water reduces the friction with the track and the visibility of the driver.
3. The correct answer is C! When the track gets wet the visibility is reduced due to the aerosol coming from behind the cars in front . Imagine driving at 200 kph and only seeing the white trail from the car next to you. As we have also seen in this section, water reduces the coefficient of friction between the track and the tire to 1,05 on the Ultra Wet tire.
4. Are drivers faster through a corner when it rains? • A) No, the rain reduces the coefficient of friction meaning the maximum velocity is lower than in wet • B) Yes, as the rain helps reduce friction this means there is less speed lost in the corner. • C) The same, even though the coefficient of friction is lower, wet tires make up for the loss of grip, so the velocity through the corner does not change between dry and wet.
5. The correct answer is A! If we look at the expression of the maximum velocity discussed above : We see a dependence on µ. If this quantity is reduced, so is the velocity.
6. What are some of the real life limitations we could not apply to our model? • A) The track isn’t homogeneously wet therefore the coefficient of friction varies throughout the circuit. • B)The coefficient of friction changes from dry to wet • C) Some tires have better grip than others
7. The correct answer is A! When it starts to rain the racing line usually stays dry the longer as more cars are taking that line and evacuating water. This means there are parts of the track with more water than others. This leads to a variation in the coefficient of friction that is hard to predict. Therefore in these occasions it’s the skill of the drivers that stand out.