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The 55−kg block rests on the horizontal surface, and a force P = 414 N, whose direction can be varied, is applied to the block. (a) If the block begins to slip when θ is reduced to 21∘, calculate the coefficient of static friction μs between the block and the surface. (b) If P is applied with θ = 34∘, calculate the friction force F. The force F is positive if to the right, negative if to the left. Answers: (a) μs = (b) F = N

The 55−kg block rests on the horizontal surface, and a force P = 414 N, whose direction can be varied, is applied to the block. (a) If the block begins to slip when θ is reduced to 21∘, calculate the coefficient of static friction μs between the block and the surface. (b) If P is applied with θ = 34∘, calculate the friction force F. The force F is positive if to the right, negative if to the left. Answers: (a) μs = (b) F = N

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The 55 − k g block rests on the horizontal surface, and a force P = 414 N , whose direction can be varied, is applied to the block. (a) If the block begins to slip when θ is reduced to 21 ∘ , calculate the coefficient of static friction μ s between the block and the surface. (b) If P is applied with θ = 34 ∘ , calculate the friction force F . The force F is positive if to the right, negative if to the left.
Answers: (a) μ s = ◻ (b) F = ◻ N

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