Discussion
Which phenomenon occurs near the natural frequency of the unsprung mass?
Answer: B
The wheel and tyre form a second mass spring system that resonates around ten to fifteen hertz, and at that frequency the tyre loses contact intermittently. Damping controls it. Body float is the low frequency equivalent. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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