问题 填空题

小题1:有一游标卡尺,主尺的最小分度是1mm,游标上有20个小的等分刻度。用它测量一小球的直径,如图甲所示的读数是        mm;用螺旋测微器测量一根金属丝的直径,如图乙所示的读数是        mm.

小题2:① “探究求合力的方法”实验装置如图甲所示,其中A为固定橡皮筋的图

钉,O为橡皮筋与细绳的结点,OB和OC为细绳.图乙是在白纸上根据实验结果画出的图示.F与F /中,方向一定沿AO方向的是      .(填“F”或“F ′ ”)

②上述实验采用的科学方法是     。

A.理想实验法

B.等效替代法

C.控制变量法

D.建立物理模型法

答案

小题1:10.50        1.731

小题2:F              B 

小题1:游标卡尺的主尺读数为10mm,游标读数为0.05×10mm=0.50mm,所以最终读数为10.50mm.

螺旋测微器的固定刻度读数为1.5mm,可动刻度读数为0.01×23.1mm=0.231mm,所以最终读数为1.731mm.

故本题答案为:10.50  mm;    1.731  mm

小题2:①F是通过作图的方法得到合力的理论值,而F′是通过一个弹簧称沿AO方向拉橡皮条,使橡皮条伸长到O点,使得一个弹簧称的拉力与两个弹簧称的拉力效果相同,测量出的合力.故方向一定沿AO方向的是F′.

②合力与分力是等效替代的关系,所以本实验采用的等效替代法.故选B.

故本题答案是(1)F′(2)B

单项选择题
单项选择题

Recently, I flew to Las Vegas to attend a meeting. As we were about to arrive, the pilot announced with apology that there would be a slight (16) before setting down. High desert winds had (17) the airport to close all but one runway. He said that we would be (18) the city for a few minutes waiting to (19) . We were also told to remain in our seats meanwhile with our seat belts fastened (20) there might be a few bumps(颠簸). Well, that few minutes turned into about four-five minutes, including a ride that would make a roller coaster(过山车) (21) by comparison. The movement was so fierce that several passengers felt (22) and had to use airsickness bags. As you might guess, that’ s not a good thing to have happen in a(n) (23) space because it only (24) to increase the discomfort of the situation.

About twenty minutes into the adventure, the entire airplane became very (25) There was now a sense of anxiety and fear that could be (26) noticed. Every passenger simply held on for dear life …except one. A (27) was having a good time! With each bump of the (28) , he would let out a giggle (咯咯地笑)of delight. As I observed this, I (29) that he didn’t know he was supposed to be afraid and worried about his (30) . He neither thought about the past nor about the future. Those are what we gown--ups have learned from (31) . He was (32) the ride because he had not yet been taught to fear it. Having understood this, I took a deep breath and (33) back into my seat, pretending I was (34) on a roller coaster. I smiled for the rest of the flight. I even (35) to giggle once or twice, much to the chagrin(随恼) of the man sitting next to me holding the airsickness bag.

(35)()

A.attempted

B.managed

C.wanted

D.decided