The Research On "Uniform Variable Linear Motion" Knowledge Structure In High School Physics

Adopting literature research,text research and investigation,for example,in the unit of uniform variable linear motion on Senior high school physics,studying its structure of knowledge.The major purposes of the research can be included:first,carding the knowledge structure of chapters in order to help students build the scientific cognition structure;second,excavating the scientific method of thin unit and hoping can attract teachers importance on scientific teaching;third,researching and analyzing the different levels two schools knowledge and the relevance homework to give teaching suggestions.This passage is according to the curriculum and examination outline carding the knowledge obtaining and the knowledge application on uniform variable linear motion.The results show that the knowledge obtaining is made up 9 sub-knowledge structures:first,exploring the regulation of vehicles velocity changing with time;second,the v-t images;third,v=v0+at;fourth,(?)=x/t=v0+vt/2=vt/2;fifth,x=v0t+1/2at2;sixth,the s-t images;seventh,△x＝ aT2 and xm-xn＝(m—n)aT2;eighth,v2-v02= 2ax;ninth,the free-fall motion.The knowledge application be specify into 12 knowledge structures:first,exploring the experiment questions on uniform variable linear motion;second,the v-t image questions;third,the x-t image questions;fourth,the image conversions;fifth,the formula vector;sixth,the vehicle brake;seventh,the proportion;eighth,displacement in n seconds;ninth,the multistep process;tenth,the 0-v-0 questions;eleventh,the equal time intervals;twelfth,the chasing and meeting questions.The carting of knowledge obtaining shows on 7 scientific physics methods:first,the experimentation;second,the image method;third,the formula derivation;fourth,the differential element method;fifth,the limit thinking;sixth,the idea model;seventh,the analogy.Carding the knowledge application and finding 8 physical scientific methods:first,the image method;second,the successive differential method;third,the segment method;fourth,the hypothesis;fifth,the reverse thinking;sixth,the icon-method;seventh,the proportion method;eighth,the critical method.Select two schools with different levels and analyze the knowledge points examined in the homework of this unit to find:①The assignment covers 4 types of questions:calculation questions,image questions,experiment questions and basic questions.②In calculations,different kinematic formulas are tested to different degrees,and each formula is also investigated to different extents.The school with lower teaching quality focuses on x＝v0t+1/2at2and(?)=x/t=v0vt/2＝vt/2,while the higher quality school focuses on v=v0+at and x=v0t+1/2at2.x=v0t+1/2at2 is focused on solving x and t.△x=aT2 and xm-x＝(m-n)aT2 focus on a.For v=v0+at,the lower focuses on finding a,but the higher focuses on vt and t;for v2-v02=2ax,the lower focuses on vt,1however,the higher focuses on finding x;for(?)=x/t=v0+vt/2=vt/2 the lower focuses on solving(?),while the higher focuses on(?)and x.③There are three image questions:v-t images,x-t images and five types of image conversions.The lower doesn't have x-t images,while the higher assesses each knowledge.For v-t images,the lower focuses on the magnitude of displacement,but the higher focuses on the displacement magnitude and the velocity direction;for image conversions,the lower examines equally each situation,while the higher focuses on the turn from character to v-t image;for x-t images,the higher focuses on the velocity magnitude.④The experimental questions mainly involve ticker-tape timer,and focusing on the calculation of velocity and acceleration.⑤The basic question examines four aspects of knowledge:uniform variable linear motion,comprehension of motion relations,free fall,and Galileo's research in free fall.Finally,teaching suggestions are proposed from the three dimensions of new lesson teaching,review teaching and homework.