18.1.6. Bodies 1 and 2 can slide on a horizontal stationary plane. Elementary work is the first reaction of the body due δA = Nδr = 0, and the second body δA = Rδr ≠ 0. Specify the number of the body, which is superimposed on the ideal relationship.

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(DYNAMICS, Chapter 18 - The principle of D'Alembert, paragraph - 18.1: Communications and equations) of Reshebnik to the collection of short tasks on the theoretical mechanics Kep OE, JA Viba, OP Grapis, JA Svetinysh et al. Publishing Moscow / Graduate School / 1989, 2009, 2012.
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