Fun stuff! From Physics Forums:
The torque on the wheel, divided by the radius of the tire equals the backwards
horizontal force applied to the ground. The ground "reacts" with an equal and
opposite forwards force and this force / mass of (rider + vehicle) =
acceleration.
[T]here is one interesting physics moment that I feel obligated to point out: a
motorcycle chase scene in which Bourne tries to prevent a CIA assassin from
snuffing out the closest thing he has to a romantic interest. While taking a
short cut, Bourne jumps his motorcycle over what appears to be a six-foot
concrete wall. ... To accomplish this stunt, Bourne must not only be capable of jumping six feet
straight up, he has to be able to do it while holding onto a 200-pound
motorcycle.
Tennessee Tech (PDF):
Newton’s Second Law is a relation between the net force (F) acting on a mass m and its acceleration a.
In other words, if the acceleration vector representing the net combination of
accelerations (from cornering, acceleration, and braking) lies within the
friction circle, the tire will grip; otherwise, it will slip.
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