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What is its moment about the other end?","back":"50 N m.","mcqOptions":null},{"id":"e340faaf-8a96-425a-9fef-73c2c8c1c970","cardType":"cloze","points":null,"front":"For static equilibrium, horizontal forces satisfy $\\text{[...]}$.","back":"For static equilibrium, horizontal forces satisfy $\\boxed{\\sum F_x=0}$.","mcqOptions":null},{"id":"caa4a327-9cfa-494c-9e29-2b23c5caab6e","cardType":"cloze","points":null,"front":"For static equilibrium, vertical forces satisfy $\\text{[...]}$.","back":"For static equilibrium, vertical forces satisfy $\\boxed{\\sum F_y=0}$.","mcqOptions":null},{"id":"9eba0be3-1a8d-4ee8-959c-919132f93238","cardType":"cloze","points":null,"front":"For rotational equilibrium, moments satisfy $\\text{[...]}$.","back":"For rotational equilibrium, moments satisfy $\\boxed{\\sum M=0}$.","mcqOptions":null},{"id":"d1785d40-2497-4e96-8104-ca12135fd7ec","cardType":"basic","points":2,"front":"Why take moments about a point through which an unknown force acts?","back":"The unknown force has zero moment, eliminating it from the equation.","mcqOptions":null},{"id":"598c357a-6d83-486c-904f-032b95058308","cardType":"basic","points":1,"front":"Where does the weight of a uniform rod or ladder act?","back":"Vertically downward through its midpoint.","mcqOptions":null},{"id":"89010e2b-c739-4a41-97c4-f137b361d80d","cardType":"cloze","points":null,"front":"Mass $m$ produces weight $\\text{[...]}$.","back":"Mass $m$ produces weight $\\boxed{W=mg}$.","mcqOptions":null},{"id":"53510c1b-9b84-4ba1-9344-001964be777e","cardType":"basic","points":3,"front":"How do normal reactions act at a horizontal floor and vertical wall?","back":"

Floor reaction: vertical
Wall reaction: horizontal

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The force acts opposite to the assumed direction
A negative normal reaction may mean contact is impossible

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