论文部分内容阅读
一、单项选择题 1.坐在匀速行驶着的列车里的乘客,看到铁路两旁的树木迅速后退,这位乘客所选取的参照物是:( ) A.树木. B.地面. C.迎面驶来的列车. D.乘客乘坐的列车. 2.关于质点的下列叙述,正确的是:( ) A.质量很小的物体可看作质点. B.体积很小的物体可看成质点. C.在任何情况下,地球都不可以看作质点. D.凡是做平动的物体都能看作质点. 3.如图l所示为甲、乙两个质点沿同一条直线做直线运动的v—t图线,则以下判断中,哪个是正确的:( ) A.两质点不是同时开始运动. B.两质点一定从同一地点开始运动. C.两质点都作初速为零的匀加速运动.
First, single-choice questions 1. Passengers sitting in trains traveling at constant speed, seeing the trees on both sides of the railway quickly retreat, the passengers selected the reference object: () A. Trees. B. Ground. C. Face to face The incoming train D. The train the passenger is riding on. 2. The following statements about the particle are correct: () A. Objects of very small mass can be regarded as particles. B. Objects of very small size can be seen as particles. C. In any case, the earth can not be regarded as a particle. D. Any object that does translation can be regarded as a particle. 3. As shown in Figure 1, two particles A and B make a straight line along the same straight line. In the following v-t graph, which of the following judgments is correct: () A. The two particles do not begin to move at the same time. B. The two particles must start from the same position. C. Both particles have zero initial velocity. Acceleration.