Simply when you are driving a vehicle you are holding onto the steering wheel, your arms are connected to your shoulders which are at the top of your body giving you the best possible anchor point, also when you turn a corner you automatically lean into it, imagine where your hands are on the steering wheel (should be the 10 to 2 position like off an anologue clock face), you turn left your right arm lifts up and your left arm comes down, this twists your body and helps you to counter the centrifugal forces. The same is also applied in other forces experienced on a driver: Acceleration, in which case you can still hold onto the steering wheel and off-set the forces with your arms, de-acceleration where you can also use the steering wheel to push against. (I have to note that up and down forces on both a passenger and driver are almost felt identically, ie when moving quickly over a ramp)

Now for the passenger, they only have contact with the seat and the main point of contact and weight is applied to the derier (bottom in english), when the car turns the corner the top half of the passenger will be pushed either to the right of left depending on the direction the vehicle is turning and this will cause preassure on the lower back to correct the position, then the force will no longer be applied when the vehicle is heading in a straight line and the passenger will have to again correct there position. I think you get the idea…….

I think this physical explanation is important to note when having to consider other peoples perspectives. I think peoples perspectives are in most cases affected by the physical world and therfore taking the time to understand these is the first step in understanding others.