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1999年高考全国物理卷和近几年的高考题一样,对中学物理教学有着良好的导向作用。下面是从其中几道题所获取的启迪。 1 要坚持理论联系实际的原则【题14】一跳水运动员从离水面10m高的平台上向上跃起,举双臂直体离开台面,此时其重心位于从手到脚全长的中点。跳起后重心升高0.45m达到最高点。落水时身体竖直,手先入水(在此过程中运动员水平方向的运动忽略不计)。从离开跳台到
The 1999 National Physical Examination in the college entrance examination, like the college entrance examination question in recent years, has a good guiding role in physics teaching in middle schools. The following is the enlightenment obtained from several questions. 1 To adhere to the principle of combining theory with practice. [14] A diver jumps upward from a platform 10m above the water surface, lifts his arms straight out of the deck, and his center of gravity is at the midpoint of the full length from hand to foot. After the jump, the center of gravity rose 0.45m to the highest point. The body is vertical when it falls into the water, and the hand enters the water first (in this process, the horizontal movement of the athlete is neglected). From leaving the platform