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Homework Help: Strength-to-weight ratio?

  1. Nov 13, 2005 #1
    What is meant by.
    "strength-to-weight ratio"?
    Please explain.
     
  2. jcsd
  3. Nov 13, 2005 #2

    FredGarvin

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    Science Advisor

    Strength to weight ratio = (strength)/(weight).

    A ratio of >1 is usually a good thing. That means that the thing in question has more 'strength' than weight/mass.

    Pretty cut and dry.
     
  4. Nov 13, 2005 #3
    its a measure of the efficiency of a structure - normally associated with things like bridges.

    It compares the weight of the structure itself to the amount of weight it can carry/support without collapsing.

    For example the miniature wood-stick bridges you build at school will have a very high strength to weight ratio - in the hundreds, sometimes the thousands. This is because they weigh only a couple dozen grams, yet are able in some instances to hold one or two hundred kilograms without breaking!

    A modern-day metal bridge however will have a strength to weight ratio nearer to 1.
     
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