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2008年天津高考理综中一道物理题由于解法存在偏颇,我在此提出来有望各位同仁提出意见,仁者见仁,智者见智。题目如下:在粗糙的水平地面上与墙平行放着一个截面为半圆的柱状物体A,A与竖直墙之间放一个光滑圆球B,整个装置处于静止状态,现对B加一竖直向下的力F,F的作用线通过球心,设墙对B的作用力为F1,B对A的作用力为F2,地面对A的作用力为F,若F缓慢增大而整个装置仍保持静止,截面如图所示,在
2008 Tianjin College Entrance Examination in a comprehensive physical problem due to bias in the solution, I hereby put forward my colleagues hope to put forward opinions, benevolent see the benevolence, the wise see the wisdom. The topic is as follows: On a rough level ground placed in parallel with the wall of a columnar object with a semicircular section A, put a smooth ball B between the vertical wall and A, the entire device is at rest, now B plus a vertical The downward force F, F line of action through the center of the ball, set the wall force of B on the F1, B on the force of A is F2, the ground on the force of A F, if F slowly increases and the whole The unit remains still and the cross section is as shown