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一、平均速度的意义“速度”是用来表示物体运动快慢的物理量.对于作匀速直线运动的物体,由于它们运动的快慢和方向均不变.即速度的大小不会变化,这个速度是准确地反映了它的运动快慢情况.但在日常生活中.人们见到的大量物体的运动如火车、汽车等交通工具的开行、停下:工厂里行车、电瓶车的开行、停止;人们走路、跑步等等,都是时快时慢的.也就是说.大量物体的运动都是变速运动,用“平均速度”只能粗略地反映出作变速运动的物体在某段路程中的平均快慢程度.比如,汽车从甲城开到乙城的速度是45千米/小时.是指的平均速度.在从甲城开往乙城的过程中,某段路程时的速度可能分别是30千米/小时、70千米/小时.
First, the meaning of the average speed “Speed” is used to indicate the physical speed of the object movement speed. For uniform linear motion of objects, because of their speed and direction of movement are unchanged. That is, the size of the speed will not change, this speed is accurate It reflects the speed of its movement. But in daily life, people see a lot of movements of objects such as trains, cars and other means of transportation. Stops: driving in factories, starting and stopping of electric cars, and people walking and running. And so on, both are fast and slow. That is to say, the movement of a large number of objects is a variable speed movement, and the average speed can only roughly reflect the average speed of an object moving in a certain distance. For example, the speed at which a car is driven from A town to B city is 45 km/h. It refers to the average speed. During the journey from K town to B city, the speed at a certain distance may be 30 km/hour respectively. Hours, 70 km/h.