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Which component resists body roll without affecting single wheel bumps?

  • A.The coil spring, whose rate determines how far the body rolls for a given lateral acceleration during a corner
  • B.The anti-roll bar
  • C.The damper, which resists the movement of the suspension and therefore limits the rate at which the body may roll
  • D.The bump stop

Answer: B

An anti-roll bar is a torsion bar connecting the two sides, so it twists only when the wheels move differently and does nothing when both rise together. That is precisely why it can stiffen roll without stiffening the ride. Springs stiffen both. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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