Some information we gathered consisted of:

Gathering Information

1.) you must put stoppers on either side of the screws to prevent the axle from moving side to side

2.) the longer the extension the better because it will elongate the distance the car will go from the extension starting at the back and then slowly moving forward, giving the car more tome to travel a greater distance

3.) if you have a long string, you can wind it around the axel more times, increasing the distance the car will travel

4.) you must also make a cut out at the back of the car where the string can connect to the axle without getting stuck

Sources:

- http://www.instructables.com/id/Mouse-Trap-car/
- http://m.wikihow.com/Adapt-a-Mousetrap-Car-for-Distance
- http://www.docfizzix.com/design-help/
- http://www.mousetrap-cars.com/distance_pics.htm
- http://auto.howstuffworks.com/mousetrap-powered-car1.htm