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With regards to the combination of horizontal and vertical normal forces…True vertical load however will always sum to the weight, unless as previously discussed, c.g. is accel'ing up or deccel'ing down.
Fabrico (Automotive) 23 Mar 06 18:50
Ok. There is added force pushing downward on the dummies head (you left out the mustache), the seat springs are compressing, and so is the tire. There is even added force where the bottom of the rim sits on the tire. But no added downward force on the ground. It's amazing that any simple tire can split these two "distinct" forces with such precision!
Virtually every force within the unicycle is on a single line with a single contact patch. How can it apply two distinct pressures going in two different directions against the ground?
I guess the question is: are lateral and vertical forces separated for teaching and analysis, or are they really separate?
As you said earlier the neck witnesses a higher compressive force. This is perfectly true.
But this is because the neck axis isnt in the vertical plane anymore, as its on the angle the neck also sees a fraction of the lateral force. So the ground itself does see more load from the tyre, BUT its exactly the same force in the vertical direction