Basic rules:

Weight: Race cars may weigh no more than five (5) ounces (total weight) as determined on the official scales during race day inspection.

Wheels and Axles: The car shall roll on the wheels from a kit. The wheels must turn about the axle nails from the kit. The axle nails need to be firmly affixed to the wood of the car body.

Power: From the beginning to the end of the race no combustion of any part of the car can occur.  Under normal operating conditions the mass of the vehicle should remain essentially unchanged and chemical reaction should not occur as a part of normal operation.   

Size: Race cars cannot be longer than 7 inches, wider than 2.75 inches, or taller than 3 inches. Underside clearance of at least 0.375 inches and inside wheel to wheel clearance of at least 1.75 inches is recommended, so that the car will run on the racetrack.

Weights and Attachment: Weight may be added to the car and will be considered part of the car for purposes of all measurements. All weight must be securely fastened to the car. Weights cannot be electromagnetic or use adhesive.

Wheels: Wheels should be based on the wheels in the kit.  Modifications may be made to the model.

Gravity Powered: The race car may not be constructed or treated in such a way that the track's starting mechanism imparts momentum to the car. (For instance, this provision disqualifies cars with sticky substances on the front of the car and protrusions which may catch on the starting pin.)

Lubricants: Lubricants must be dry at the time of inspection and racing.

Staging: The entire car must stage behind the starting gate

Rules and Goals

Rule #1 All modifications must be represented in your model!

Goal #1 Reinforce all of the concepts of the course
Goal #2 See how to apply ideas
Goal #3 See what matters and then to win

More technical links...try to see why I suggested them:

More stuff 12-10-07

Rolldown tests (more accurate than you need but you get the idea)

A simple equation:


and FF is the frictional force.

And another application of the effects of friction on your life (or someone's life):