A common material for cushioning objects in packages is made by trapping bubbles of air between sheets of plastic. Is this material more effective at keeping the contents of the package from moving around inside the package on (a) a hot day, (b) a cold day, or (c) either hot or cold days?
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Answer:
a) a hot day
Explanation:
Considering the main role of the protective packing material as protection against mechanical damage and external impact, it must be more effective in a warm day than in a cold day. In a warm day, the material is more ductile and softer, so can absorb and digest more mechanical energy than when it is less ductile (brittle) in a cold day. Shoes and boots soles are more likely to crack and fracture in winter than in summer because they are more flexible in summer; they are more flexible and can absorb more energy before failure.
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Answer:
(c) either hot Or cold days
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