Problem: A 5 kg box rests on top of a 10 kg box. The friction coefficients between the 10 kg box and the floor are μs1 = 0.4 and μk1 = 0.3, and the friction coefficients between the 10 kg box and the 5 kg box are μs2 = 0.35 and μk2 = 0.25. If a horizontal force of 50 N is applied on the 10 kg box, which of the following statements is true A) There is a static friction force on the 10 kg box, but no friction force on the 5 kg box B) There is a static friction force on the 10 kg box and a static friction force on the 5 kg box C) There is a kinetic friction force on the 10 kg box and a static friction force on the 5 kg box D) There is a kinetic friction force on the 10 kg box and a kinetic friction force on the 5 kg box

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Problem Details

A 5 kg box rests on top of a 10 kg box. The friction coefficients between the 10 kg box and the floor are μs1 = 0.4 and μk1 = 0.3, and the friction coefficients between the 10 kg box and the 5 kg box are μs2 = 0.35 and μk2 = 0.25. If a horizontal force of 50 N is applied on the 10 kg box, which of the following statements is true

A) There is a static friction force on the 10 kg box, but no friction force on the 5 kg box

B) There is a static friction force on the 10 kg box and a static friction force on the 5 kg box

C) There is a kinetic friction force on the 10 kg box and a static friction force on the 5 kg box

D) There is a kinetic friction force on the 10 kg box and a kinetic friction force on the 5 kg box

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Based on our data, we think this problem is relevant for Professor Shao's class at SJSU.