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A plain sliding bearing without a curved surface or a spring has the drawback that it

  • A.dissipates no energy whatsoever during sliding
  • B.provides no restoring force and may leave a permanent offset
  • C.provides far too much restoring force and returns the building too violently
  • D.cannot carry any vertical load at all

Answer: B

Friction dissipates a great deal of energy, but nothing pulls the building back to its starting position, so residual displacement accumulates. Practical systems therefore pair sliders with a recentring element, or use a curved surface that recentres by itself.

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