Q: A lower pair is an ideal joint that constrains contact between a surface in the moving body to a corresponding surface in the fixed body. A lower pair is one in which there occurs a surface or area contact between two members, e.g. nut and screw, universal joint used to connect two propeller shafts. Cases of lower joints:\n\nAnswer this question: universal joint is an example of which pair? Let's give stream of consciousness first:
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The relevant information is: A lower pair is one in which there occurs a surface or area contact between two members, e.g. nut and screw, universal joint used to connect two propeller shafts. Therefore, the final answer is A lower pair.
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