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一、试题分析全国新课标1卷的选择题部分,选择题中力学问题有4个,电磁场问题有4个。两块主干知识各占50%。选择题部分考查力学问题的有17题、18题、20题和21题。1 7题考查圆周运动。质点从高为R处自由落体,已知质点到N点时对轨道的压力,由此求出从释放点到N点质点损失的机械能,但是质点从P--N和从N--Q对轨道的作用力并不对称,所以质点冲出Q点以后仍能继续上升一段
First, the test analysis of the national curriculum of the new curriculum 1 multiple-choice questions, multiple-choice questions in the mechanical problems 4, 4 electromagnetic problems. Two backbone knowledge each account for 50%. There are 17 questions, 18 questions, 20 questions and 21 questions for examining mechanics questions in the multiple-choice questions section. 1 7 questions check the circular motion. The mass point is free falling from R, and the pressure of the orbit from the mass point to the point N is obtained. From the point of release to the point N, the mechanical energy loss is obtained. However, the mass points from P - N to N - Q The orbital force is not symmetrical, so the point of mass out of the Q point can continue to rise after a period