As described in the study hint on page 160, use a bicycle wheel mounted on a hand-held axle (probably available from your friendly physics department) to study the angular momentum vectors and their changes. In particular, make these observations:
a. Grasp the wheel with both hands by the handles on each side and have someone give it a good spin with the wheel in a vertical plane. Then try tilting the wheel downward to the left to simulate a fall. What direction does the wheel turn? Describe what happens.
b. Grasp the wheel with both hands by the handles on each side and hold it in the vertical orientation. Without spinning the wheel, rotate it into the horizontal plane. Now repeat this, but first have someone give it a good spin with the wheel in the vertical plane. Is it harder or easier to rotate it into the horizontal plane when the wheel is spinning? Explain how this can be related to riding a bicycle.