高中物理解题难,其中解力学题,特别是以动量守恒为解题知识域的力学题最令学生头疼不已。对此,在我长达20多年的高中物理教学生涯中,确实深有感触。为了突破这一难点,笔者在近三年所带的二届毕业生的高考备考复习中,由于偶然的感 It is difficult to understand problems in high school, in which the problems of solving mechanics, especially the conservation of momentum to solve the problems of the mechanics of the knowledge domain, make students suffer headaches. In this regard, in my 20 years of high school physics teaching career, I really feel deeply. In order to break through this difficult point, the author in the last three years to take the second-graduate college entrance exam preparation review, due to the accidental feeling