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An isolator's restoring force is the force that

  • A.acts along the length of the building rather than across its shorter direction
  • B.is transmitted into the surrounding soil during the course of the shaking
  • C.pushes the building back towards its original position
  • D.resists the vertical load carried down through the bearing to the foundation

Answer: C

Without it the building would drift progressively under successive cycles and end the earthquake off centre. Rubber provides it elastically, a curved sliding surface provides it through gravity, and a flat slider provides none at all.

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