双语物理ppt课件.ppt
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1、高等教育出版社出版 Physics deals with matter,motion and their interaction.Im Walter Lewin.I will be your lecturer this term.In physics,we explore the very small to the very large.The very small is a small fraction of a protonand the very large is the universe itself.They span 45 orders of magnitude-a 1 with
2、45 zeroes.*MECHANICS(力学):Kinematics(运动学)Dynamics(动力学)Chapter 2&3 Motion in One,Two and Three Dimensions(一维,二维和三维运动)2-1 Description of motion(运动描述)A coordinate system(坐标系)is built on it.xyOzParticle(质点):Relativity of description of motion(运动描述的相对性)Absoluteness of motion(运动的绝对性)Reference Frame(参照系)sho
3、uld be chosen.an idealized model(理想模型P12)2-2.Position and Displacement(位置和位移)1.Position Vector(位矢)The position vector extends from the origin of a coordinate system to the particle(从坐标原点到质点).xyr(t)In rectangular coordinate system(直角坐标系):Motion Function(运动方程):Its three components(三 个 分 量)are written
4、by the following scalar functions(写为下列标量方程)The Trajectory equation(轨 道 方 程)can be obtained by eliminating t from these equations(可从这些方程中消去 t 得出)ikj P,z(t0)(t)zxyO2.Displacement(位移)yx0r1(t)ABzr2(t+t)r Displacement depends only on the position of initial point and final point,(i).The magnitude of vect
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