What is the difference between the way the back wheels are connected
and the front wheels are connected?
Back wheels are connected with one axle. Front wheels are each on separate
axle connectors.
Why should the wheels go on so that the yellow hub is closest to the
beam?
The rubber side of the wheel has so much friction it does not side.
Why are 2 by 4 plates used?
The thin plates do not hold the rectangle shape
and there can be too much friction with the axles in the holes if they
are not straight.
They worked in teams of two to do and record the project.