八年级物理上册3.1运动与静止练习新版北师大版20190122431.doc

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1运动与静止1 把汽车的行驶、轮船的航行、飞机的飞行、运动员的跑步等这类物体位置发生变化的运动叫做 2坐在正在行驶的汽车里的乘客说他是运动的,这是以 为参照物;说他是静止的,这是以 为参照物 3夜晚抬头望星空时看到:“月亮在云里穿行”,这是以 为参照物;“乌云遮住了月亮”,是以 为参照物 4图中的特技跳伞运动员只有在他们保持 时,才能形 成一定的造型 5图(a)、(b)两图表示游戏“谁在动”中的两个情景坐在 石块上的小孩先用双手蒙住双眼,后放开手,发现编 和 的小朋友作了机械运动(以地面为参照物) 6下列说法正确的是 ( )A空气的流动不属于机械运动B只有机器的运动才是机械运动C任何物体如果以自身为参照物,它的速度就是零D参照物必须是绝对不动的物体7卡车和联合收割机以同样的快慢,向同一方向前进,下列有关它们的说法正确的是 ( )A相对于地面来说,联合收割机是静止的B. 选卡车为参照物,联合收割机是静止的C. 相对于联合收割机来说,卡车在运动D选地面为参照物,卡车是静止的参考答案1 机械运动; 2.地面上的建筑物或树木;3云,月亮; 4相对静止; 51,3267

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