M=0.30 30 kg P< 50 kg Hs=0.40 40 kg 30° μg = 0.45 Figure WDG-3F
The three flat blocks are positioned on the 30° incline as shown in Figure WDG – 3F, and a force P parallel to the incline is applied to the middle block. The upper block is pre vented from moving by a wire which attaches it to the fixed support. The coefficient of static friction for each of the three pairs of mating surfaces is shown.
1. Calculate the normal force (N) acting between 50-kg and 40-kg blocks (ANSWER: 680) and the maximum frictional resistance (N) on the surface between the 30-kg and 50-kg blocks (ANSWER: 76.5)
2. Calculate the maximum frictional resistance (N) on the surface between the 40-kg block and inclined surface (ANSWER: 459) and also determine the maximum value which P (in N) may have before any slipping takes place (ANSWER: 94).
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