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教学效果的差异在很大程度上是教师的学科教学知识即PCK形成的,笔者结合自己的教学经历,以教学案例为例主要从新课导入、重难点知识的教学、习题课的教学三个方面阐述了基于PCK理念如何进行教学设计以提高教学效果,培养学生的学习能力.位于水平地面上的质量为M的小木块,在大小为F、方向与水平方向成α角的斜向上拉力作用下沿地面做匀速直线运动,木块与地面之间的动摩擦因数μ.求:(1)地面对物体的支持力是多少?(2)木块与地面之间
The difference in teaching effect is to a large extent the teacher’s subject teaching knowledge, namely PCK. The author combines his own teaching experience, taking the teaching case as an example, mainly from the introduction of new lessons, the teaching of heavy and difficult points of knowledge, and the teaching of exercises. It elaborated on how to design the teaching based on the PCK concept to improve the teaching effect and cultivate the students’ learning ability. The wooden block with the mass of M on the horizontal ground was pulled diagonally upwards at an angle α between the size F and the direction and the horizontal direction. Under the uniform linear motion along the ground, the dynamic friction coefficient between the block and the ground is μ. Find: (1) What is the support of the ground on the object? (2) Between the block and the ground