The Center of Gravity (CG)
lies between the two points of
ground contact, so the wheel
is completely fixed.
Stationary With Driver
Still completely fixed.
Normal Driving Position -
Stopped
The CG lies directly above
the single point of contact,
and below the axis of
rotation, so the driver
pendulums gently.
Full Acceleration
The CG is in front of the
single point of contact,
producing an accelerating
torque.
Constant Speed
Enough torque is being
produced to overcome
friction.
Partial Braking
The CG is now behind the
contact point, producing a
braking torque.
Maximum Braking
All CG concerns are irrelevant
here, as the driving weight has
pushed the chassis to the
ground. With two points of
contact, any amount of braking
is possible, up to the point of
skidding.