3. The moment of inertia of a solid sphere is 2MR²/5, hollow sphere is 2MR²/3, solid cylinder is MR²/2, and hollow cylinder is MR². All of the same mass M and the same outer radius R. If these four objects are released from rest at the top of an incline and start rolling without sliding. Which one will the last arrive at the bottom?
(A) solid sphere
(B) hollow sphere
(C) solid cylinder
(D) hollow cylinder

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詳解 (共 1 筆)

#7420906
所以這題根據轉動慣量和加速度的公式去判斷即可
6a3dff79e8f94.jpg
如果轉動慣量越大,分母越大,加速度越小,物體越慢
所以比較轉動慣量就好
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