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Gravity Racer Test Review. 1. Considering that modifications improved the mpg from 3.5 in 1992 to 5.2 in 1997, how many miles would it take to pay off the $1,850 cost of the modification ? Round your answer to the hundredths.
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1. Considering that modifications improved the mpg from 3.5 in 1992 to 5.2 in 1997, how many miles would it take to pay off the $1,850 cost of the modification? Round your answer to the hundredths.
1. Considering that modifications improved the mpg from 3.5 in 1992 to 5.2 in 1997, how many miles would it take to pay off the $1,850 cost of the modification? 5.2 – 3.5 = 1.7
2. With the change in fuel prices, would a trip of 350 miles cost more or less with the 2011 model than the 1997 model? How much more or less would it cost? Round your answers to the hundredths. (2 Points)
2. With the change in fuel prices, would a trip of 350 miles cost more or less with the 2011 model than the 1997 model? How much more or less would it cost? (2 Points) 1997 Model The 2011 model costs more 2011 Model $164.75 - $82.79 = $81.96 more
3. How far can each model truck travel on $958? What model year can travel the furthest on $958? Round your answers to the hundredths. (5 Points)
3. How far can each model truck travel on $958? What model year can travel the furthest on $958? Round your answers to the hundredths. (5 Points) The 1997 model can travel the furthest 1987 1997 1992 2011
4. What did Nicolas Cugnot create? • First self-propelled land vehicle in France.
5. What did Oliver Evans create? • First self-propelled land vehicle in America.
6. Which person designed their vehicle first, Cugnot or Evans? • Nicolas Cugnot • Cugnot created his vehicle in 1769 while Evans created his in 1805
7. What did Charles and Frank Duryea build? • Produced 1st publically sold US automobile
8. Explain the difference between front-wheel and rear-wheel drive. (2 Points) • In front-wheel drive the energy produced by the engine powers the front wheels. • In rear-wheel drive the energy produced by the engine powers the rear wheels.
9. Define Aerodynamics. • The study of airflow and the forces involved when an object moves through the air
10. Define Drag. • Wind resistance that tends to hold a vehicle back when it moves forward.
11. Define Laminar Flow. • Straight and even airflow
12. Define Vortices/Eddies. • Swirling of air due to lack of laminar flow. Separation of the air causes these swirling patterns which result in increased drag.
13. Place an “X” on the track below to show where racers will either gain or lose any advantage. Explain your placement. (2 Points) • Once the car reaches the flat section of the track, the gravity pulling down on it is no longer speeding it up. X
14. Where should you add weight to vehicle in order to provide the greatest advantage? • The back of the vehicle.
15. Define System • A group of things working together.
16. Define Subsystem • A system within a system, or a smaller part of a system
17. The basic framework of a system; Ex. car frame • Structure
18. The transportation system’s connection to its environment, which supports the weight of a vehicle as it moves down a path; Ex. boat hull on water • Suspension
19. Determines the speed and direction of a vehicle; Ex. steering wheel • Control
20. Provides assistance in staying on course by providing information concerning the control of the vehicle; Ex. GPS • Guidance
21. Provides movement for the system by creating the force that moves the vehicle toward the destination; Ex. propeller • Propulsion
22. Items that aid the system but are not directly part of it; Ex. gas stations • Support
