In a race like the Indianapolis 500, a driver circles the track counterclockwise and feels his head pulled toward one shoulder. To relieve his neck muscles from having to hold his head erect, the driver fastens a strap to one wall of the car and the other to his helmet. The length of the strap is adjusted to keep his head vertical. Required:
a. Which shoulder does his head tend to lean toward?
b. What force or forces produce the centripetal acceleration when there is no strap?
c. What force or forces do so when there is a strap?