Goal:

-Have the fastest Water Bottle Racer accellerated by gravity.

Rules:

-Students will work alone.
-The car must be made from a 12 to 20 ouncce plastic water bottle, which must remain intact, only small holes for the axels can exist.
-The wheels must be at least 4.5 cm apart but no wider than 12 cm.
-The axle must be at least 1.5 cm from thee ground.
-The maximum total dimensions cannot exceeed:
·Height 15 cm
·Width 12 cm
·Length 23 cm
-The maximum mass of the car is 200 g.
> -Additions to the car must stay within thee listed dimensions.
-The only source of energy for the car is gravitational potential energy (i.e. no rubber bands, jets, internal combustion or atomic powered engines!!!)
-In order for the car to receive full creddit, it must roll down a track by itself and it must be painted.
-The decision of the judge (teacher) is fiinal.
-Late projects will not be accepted.

Grading:

-Description and diagrams of the racer worrth 10 points.
-Complete racer worth 5 points.
-Racer built within all specifications worrth 20 points.
-Racer rolls down track by itself worth 5 points.
-Calculations of acceleration, final veloccity, kinetic energy, coefficient of friction and conclusion worth 10 points.
-Racers tastefully decorated worth 5 EXTRAA CREDIT POINTS!