Note:  The gear in the back is used only as a catch for the rubber band to help it start wrapping around the axle.
The bushing on the axle at the very front is to loop the rubber band around.

Questions:
How does the length or width of rubber band change how far the car can travel?

Why does having the rubber band come loose when it unwinds help the car continue to travel?

What is inertia?

How far did your car travel?

Procedure:  Two students work together per set.
One student should be in charge of making sure the building is done carefully and pieces are placed back at the end.
One student should be in charge of making sure the report is done well and turned in.
Math concepts:  Measuring in inches and centimeters.
Science concepts: Strain energy
inertia
Some pictures