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中学物理中有一些知识,教师自以为对其了然于心,实际却存在着认识上的误区.若稍有不慎,就会在课堂上讲错.以下列举几例加以说明,以此引起教师们的注意.1飞机的升力如果问:飞机能够飞上天空,其所需要的升力来自哪里?你可能会说:来自机翼上、下表面受到空气的压力差.如果再问:这个压力差是怎样形成的?你就会说:由于机翼形状的不对称,下方比较平直,上方弯曲,飞机飞行时,机翼上、下方气流的
There are some knowledge in high school physics, teachers think they know it in the heart, but there are actually misunderstandings, if a little careless, it will be wrong in the classroom. The following list a few examples to explain, in order to cause Teachers’ Attention .1 Aircraft Lift If you ask: Where does the airplane fly to the sky, where does the required lift come from? You might say that the pressure on the lower surface from the wing is lower than the air pressure. What is the difference? You will say: Due to the asymmetrical shape of the wings, the lower part is relatively straight and the upper part is curved. When the aircraft is flying, the air flow above and below the wing