Answers: B
5) If you want to push a block of ice of mass m at constant speed over a surface with a coefficient of friction μk, which method will require you to exert less force: (a) pushing at an angle of 25° below the horizontal, or (b) pulling at an angle of 25° above the horizontal? To answer this, draw free body diagrams for both scenarios and calculate the magnitude of the pushing or pulling force in terms of m, g, and μk. Assume that is the same in both cases. 2 25° (a) F' 25° (b) F
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