02.8.自由落体运动（02.8. free fall motion）.doc

02.8.自由落体运动（02.8. free fall motion） free falling movement I. teaching objectives 1. requirements for physical knowledge: (1) know what a free fall movement is; (2) the conditions of free fall; (3) recognize the characteristics of free fall movement; (4) grasp the law of free fall motion; the law of change of speed with time; the law of displacement change with time (quantitative). 2. through the observation of demonstration experiment summarizes the free fall motion is the initial velocity of uniform rectilinear motion of zero, so as to cultivate students ability of observation and summary, the change of physical quantity of learning, training analysis, reasoning ability. 3., the infiltration of physical methods of education, the use of idealized methods, highlighting the main factors, ignoring secondary factors, abstract physical model - free fall, the study of the whereabouts of objects in the ideal conditions of movement. Two, key and difficult analysis 1., the key is to make the students master the law of the velocity and displacement of the falling body with time. The characteristic of a free fall is that the initial velocity is zero and is only affected by gravity (the acceleration of the object is a free fall acceleration g). The 2. difficulty is to demonstrate the skills and rules of the experiment, and introduce Galileos experimental verification and clever reasoning. Three, teaching aids 1. free fall demonstration instrument and accessories, calculator. 2. coins ($two), paper bag (just hold coins), an Newton tube. 3. projectors, projector and crayons. Four, the main teaching process (I) review questions S1: S2: s3=1: 4: 9, s, I, s, II, s, III = 1, 5, 3: (two) introduce new courses We apply these knowledge today to study a common movement, the movement of falling objects. [demonstration] coins and paper bags start at rest at the same height and fall at the same time. Observe the falling velocity. From the surface, the conclusion is that the heavier the obje