
初三复习(初一下册第6章)
Authored by LIM KANG林惟康
Science
7th - 9th Grade
Used 14+ times

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19 questions
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1.
MULTIPLE SELECT QUESTION
1 min • 1 pt
下列哪种现象的物体一定受到了大小相等、方向相反的两个力的作用?(多选题)
迅速下降的飞机
匀速直线运动的汽车
投进蓝框的三分球
静止在桌面上的书本
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
哪两项是保持建筑物平稳的因素?
P - 建筑物的高度
Q - 建筑物的颜色
R - 建筑物的底部面积
S - 建筑物的独特性
P和Q
P和R
Q和S
R和S
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
为什么长颈鹿要把四条腿张开?
为了秀美腿
为了能喝到更多水
为了能把颈项伸直
为了使身体保持平稳
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
上图显示在一艘不平稳的船上站着两个人。
哪个方法能最能有效增加船的平稳性?
两人趴下
两人手拉手
让海水灌进船里来
大踏步走!1,2,1,2
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
小明参加夾豆子比賽,比赛中规定:夹起的豆子必须停留在筷子上超过5秒才算数。小明不费吹灰之力成功夹起豆子,并且停留在筷子上。下列分析中正确的是?
筷子与豆子间的摩擦力小於豆子的重量
筷子与豆子间的摩擦力等於豆子的重量
筷子与豆子间没有摩擦力
筷子夹豆子时施加的压力等於豆子的重量
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
有一物体重量為100N,靜置於水平桌面上 。若在物体兩侧分別施以在同一直线上但方向相反的水平作用力80N和75N,发现物体仍靜止不动。如图所示,则該物体所受的摩擦力大小以及方向是?
5N,向左
5N,向右
100N,向下
0N,向右
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
为什么单脚站立比双脚站立更加不稳?
因为单脚站立对地面的压力比较大
因为我们不习惯单脚站
因为双脚给予的支撑面比较大
因为重心变高
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