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初中物理教材(华东地区初中物理教材编写组)第一册第十三章,章后练习题第1题中(P158),对于“杆秤是哪一类杠杆”?我存在不同的看法,现探讨如下: 杆秤是利用杠杆原理制成的。它的杆是一根质量不均匀的木棒,如图所示。重心(包括秤钩)偏在一端,在其左侧少许,系上绳子便为提纽。然后将秤砣放在提纽左侧使杆秤平衡,那么
Junior middle school physics textbooks (East China junior middle school physics textbooks writing group) Chapter 13 Chapter 1, chapter after practice questions in the first question (P158), for “What kind of lever is the lever?” I have different views, The discussion is as follows: The steelyard is made using the principle of leverage. Its rod is a wooden rod with uneven mass, as shown in the figure. The center of gravity (including the scale hook) is on one end, a little on the left side, and Tire is tied on the rope. Then balance the balance on the left side of the lifting button, then