When a car turns in a horizontal circle, there are three planar forces (on
the tires). The upward normal force balances the downward weight (mg). The
unbalanced force is static friction, which points to the center of the
circle. There also is static friction which moves the car forward.
What about a motorcycle turning in a circle? I am a bit confused with the
FBD on the tires. Does the normal force still point upward since the road
is still horizontal? The driver leans inward toward the curve, so he/she
presses more into the seat. So the normal force on the rider is angled
inward (and greater than mg). There's also friction of the seat. So the
forces/directions on the rider are different than those on the tire?