Car number 1
My first mousetrap car went about 0 meters because it had uneven wheels and its base was to long and not wide enough to not tip over when I would let it go.
Car number 2
My second car was much more thought out. I used 2 wooden rulers as the base and I cut one more in half and nailed them into the other two so they would stay together and that was where I put the mousetrap. I then used the outside of 2 highlighters and glued it to the rulers. then i put two pens inside of them and used fix-it-stick (like super glue) to hold the wheels. Then I would wrap string around the pen and it would spin the wheels moving the back wheels (covered in duck tape for traction), forward moving the car.
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