Question regarding steering effort. (How come?)

[greg g]

We all know that steering effort is higher at rest then when moving.

With the car rolling there is rolling friction, centrifigal force of the wheel and tire (think gyroscopic resistance to out side forces) compression forces from a spring loading or unloading (like after going over a bump) increased friction in tie rods etc, due to changing angles of the steering components over bumps and during weight transfer, and at times braking forces, why is it easier to turn the wheels when the car is rolling??

[eric wissing]

The big "MO" momentum. Even at a few miles per hour there is quite a bit of weight pushing. Just my amateur opinon. Eric

[BobT-47P15]

The friction is spread over a larger area.

[Frank Elder]

Rolling resistance is less than stationary resistance due to momentum, ie gravitational forces. Took judo classes when I was in prep school and found it much easier to throw someone to the mat when you used their own force against them[they were already moving] than trying to wrestle them to the ground from a stationary position!

FRANKIE47

[1948Skip]

Would you believe "Caster action"

Skip

[claybill]

simple.....when the wheel is moving, it and the accumulated weight/motion (momentum) is doing the work for you. so you do less. think of a pulley, only rolling.!

bill

[40phil41]

inertia!

Phil

[Don Coatney]

I buy into the rolling resistance being less than static resistance. But I am not an engineer.

[claybill]

the static friction is immense. when you move, the friction is mostly overcome as the movement does the work for you.

its a friction thing....

inertia is geting the movement started in the first place, or what you ahve to overcome to get a mass to move...if not correct i am close..i hope.

harkening back to 10th grade physices...which i nearly flunked..but loved it!!

just a jerk as a kid...not much has changed!!!

claybill