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Originally Posted by 249
I am not good at physics type stuff, and it may be that I mis-read your post.
But- I've gotta believe that gyro effect of wheels increases stability. Why is it easier to balance a motorcycle going 10 mph than one at rest?
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At rest, there is no force straightening out the front wheel. When you get moving, the trailing contact patch exerts a torque about the steering head that that counters any difference between the yaw of the front wheel and the direction of travel.
Front wheels on a grocery cart point any direction they feel like when it's not moving. Once the cart is moving, they point away from the direction of travel. Same thing on a bike.