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受力情况决定运动情况,因此受力分析在运动学中是必不可少的,在重力、弹力、摩擦力三种性质的力的教学中,学生最难理解和分析的就是摩擦力了。而在摩擦力的教学中,静摩擦力部分是学生最难学懂、学会的内容了。学生对摩擦力的产生条件及方向的判断模糊不清,导致对是否存在摩擦力及摩擦力的方向判断存在困难。例如,物体在皮带的带动下做匀加速运动,当物体加速到与皮带的速度相同时,物体此后做什么运动?对此分析,学生存在困难。
Force situation determines the movement, so the force analysis is essential in kinematics, in the gravity, elasticity, friction force of three kinds of teaching, the most difficult for students to understand and analyze is the friction. In the teaching of friction, the static friction part is the most difficult for students to learn, learn the content. The students’ vague judgment of the condition and direction of the friction force leads to difficulties in judging the existence of friction and friction. For example, the object under the belt to do uniform acceleration movement, when the object is accelerated to the same speed with the belt, the object after what exercise? For this analysis, students have difficulties.