Kinematic formula arrangement 1. Definition formula of average speed: ① When infinity is taken in the formula, it is equivalent to instantaneous speed. (2) If the average rate is calculated, it should be the distance divided by the time. Note the size difference between the average rate and the average rate. 2. Two kinds of average speed expressions (the following two expressions cannot be directly applied to calculation problems) ① If the average speed of an object in the first half of the time is 0 and that in the second half is 0, the average speed of the whole process is 2. If the average speed of an object in the first half distance is 0 and the average speed in the second half distance is 0, the average speed of the whole process is 3. Definition of acceleration: ① In physics, the change is generally subtracted from the physical quantity before the change. ② When applying this formula, we should pay special attention to the relationship between the initial velocity and the final velocity direction. (3) The same direction indicates that the object is accelerating; In the opposite direction, it means that the object is slowing down. There is no necessary connection between and. 4. Three basic relationships of uniform linear motion ① relationship between speed and time ② relationship between displacement and time ③ relationship between displacement and speed 5. Three basic relationships of free-falling motion ① Relationship between speed and time ② Relationship between displacement and time ③ Relationship between displacement and speed 6. The car decelerates at a uniform speed with initial speed and acceleration. Until it stops: ① Movement time: ② Movement displacement: 7. A set of proportional formulas: an object moves in a straight line at a constant speed from rest (this premise is very important) ① 1 second, 2 seconds, 3 seconds ... velocity ratio: ② 1 second, 2 seconds, 3 seconds ... displacement ratio: ③ 1. ① ② ① The formula indicates that the average speed in a certain motion is equal to the instantaneous speed at the middle moment, ② indicates that the difference between the displacements of two adjacent segments in uniform variable speed motion is constant, and we often use this formula to judge whether an object is doing uniform variable speed motion. For example, a classmate got a paper tape with clear dots in an experiment to study automobile sports. The time interval between two adjacent counting points on the paper tape is T=0. 10s, where S 1=7.05cm, S2=0.63cm, S3=8.3 1cm, S4=8.95cm, S5=9.59cm and S6 =/kloc.