论文部分内容阅读
匀变速直线运动的速度-时间图象是一条直线,它不但把速度与时间的关系表示得很清楚,而且把位移、加速度的关系也表示得很清楚:直线下方的面积表示位移;直线的斜率表示加速度。因此,用速度-时间图象解匀变速直线运动的习题,很直观,很简便,有助于对问题的理解,它和运用公式计算起相辅相成的作用。 [例一]物体作匀加速运动,已知初速度为2米/秒,加速度为70厘米/秒~2。求第4秒内的平均速度和通过的位移,4秒内的平均速度
The speed-time image of a uniform speed-change linear motion is a straight line. It not only expresses the relationship between speed and time clearly, but also expresses the relationship between displacement and acceleration clearly: the area under the straight line indicates the displacement; the slope of the straight line Express acceleration. Therefore, using a speed-time image to smooth the exercise of variable-speed linear motion is intuitive, easy, and helpful to understand the problem. It complements the use of formula calculations. [Example 1] The object performs a uniform acceleration motion. The initial velocity is known to be 2 m/sec and the acceleration is 70 cm/sec~2. Find the average speed and passing displacement in the 4th second, average speed in 4 seconds