本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学
[单选题]
A stone attached to one end of a rod rotates in a v r h0ycgsu 79g1vv4kt+ ertical wdp9l/2t8 fe bq ,rvu*circle at a constant speed. Two posi fl98eq b,pdw*v2 rtu/ tions of the stone at two different instants, X and Y, are shown in the diagram below.
In the table below, which row is correct for the centripetal force acting on the stone at X and Y?
A. The direction of the centripetal Force is the same; The magnitude of the centripetal Force is the same
B. The direction of the centripetal Force is the same; The magnitude of the centripetal Force is different
C. The direction of the centripetal Force is different; The magnitude of the centripetal Force is the same
D. The direction of the centripetal Force is dqifferent; The magnitude of the centripetal Force is different
参考答案: C
本题详细解析:
Explanation:
The centripetal force on an object undergoing uniform circular motion is always towards the centre of the circle therefore the direction is different at the different locations. The magnitude of centripetal force is dependent on the radius of the circular path and the speed of the object. Since both of them are the same at both locations, the magnitude of centripetal force is constant throughout the motion. Therefore, the answer is C.
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