[Daily Question] Theoretical Basis 2020.02.07

2020-02-07View Original

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Multiple choice questions: The A end of rod AB is placed on a smooth horizontal surface, the angle between AB and the horizontal plane is 30°, and the rod weight is P, as shown in the figure. There is friction at B. When rod AB is balanced, the angle between the friction force at B and the x direction is ( ). A.90° B.30° C.60° D.45° Answer: B The force on the AB rod is as shown in the figure on the right. There is no friction on the smooth surface of end A, while the direction of the friction force on end B is opposite to the movement trend of rod AB, upward along the direction of the contact surface of rod AB, so the angle with the x-axis direction is 30°. Tips: Those who can explain the problem-solving process will be given extra rewards, and the answers will be visible in the replies!

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[Daily Question] Theoretical Basis 2020.02.07

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