Word: friction
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Dates: during 1950-1959
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...scientists calculated the density of the upper atmosphere by studying the gradually shrinking orbit of Sputnik I. Under the old theory, Sputnik I should stay up for about 27 months before aerodynamic drag and gravity pull it down into air dense enough to destroy it by the heat of friction. But now the Smithsonian scientists think that the moon will set for good after only 3½ months, flare into destruction sometime around the middle of January...
There is a good possibility that the shell might land in the United States. Its orbit carries it over the country six times each day. If its parts can with stand the tremendous heat of air friction it could pass through the atmosphere and land substantially intact...
Current speculation centers about the heat problem caused by the friction of the rocket and the atmosphere. Russian scientists have expressed confidence that parts of the rocket will survive the plunge towards earth, due to its special construction...
...been able, in the definition of the roles and missions of the services, to keep pace with evolving weapons system technology. As a consequence we lengthen our lead time, we make more difficult our decision-making processes, we needlessly increase costs, and we find it difficult to avoid friction and duplication of effort...
First, there is, he asserted, a lack of organization in research work. He laid this difficulty to the "archaic distinctions" between the various branches of the services. Leach added that "there is an element of friction between the services which could be reduced...