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What's that sound on cars on a hot day?

  1. Sep 13, 2011 #1
    Like on a hot day, cars make these clicking sounds on the surface? Does having a silver or white-colored car make it worst? Because I've seen black -colored ones do that too
  2. jcsd
  3. Sep 13, 2011 #2
    Without actually hearing the same sounds that you hear, it is hard to say what they might be. I believe that a likely explanation is simply the expansion of sheet metal exposed to heat. There is always a certain amount of "looseness" where such parts join, and also a certain amount of friction that opposes free expansion. When the expansive forces overcome the frictional forces, the adjustment is abrupt--producing a "clicking" sound. Metal roofs on structures do exactly the same thing.
  4. Sep 13, 2011 #3
    Let's just say the clicking sounds has a high frequency
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