配套习题- 抽象杠杆问题 -【青果学院】

1/5单选题

难度：

1.某人用扳手拧开某个固定螺丝，如果他按如图甲、乙所示两种方式拧开螺丝，则相对较省力的是（　　）

A	甲方式
B	乙方式
C	两种方式相同
D	无法判断

正确答案：Qg==

PGRpdj7nlLHmnaDmnYbnmoTlubPooaHmnaHku7ZGPHN1Yj4xPC9zdWI+TDxzdWI+MTwvc3ViPj1GPHN1Yj4yPC9zdWI+TDxzdWI+Mjwvc3ViPuWPr+efpe+8jOmYu+WKm+iHgkw8c3ViPjI8L3N1Yj7lkozpmLvliptGPHN1Yj4yPC9zdWI+5LiN5Y+Y77yMRjxzdWI+MTwvc3ViPuWSjEw8c3ViPjE8L3N1Yj7miJDlj43mr5TvvIxMPHN1Yj4xPC9zdWI+6LaK6ZW/6LaK55yB5YqbLiDlpoLkuZnlm77miYDnpLrvvIzmiormiYvlsL3ph4/lvoDmibPmiYvmn4TnmoTov5zlpITnp7vliqjvvIzlop7lpKfkuobliqjlipvoh4JMPHN1Yj4xPC9zdWI+77yM5bCx5Lya6LaK55yB5YqbLiA8L2Rpdj4=

2/5单选题

难度：

2.如图所示，用食指顶起一把金属勺子保持水平平衡状态，OA段和OB段的重分别为G₁和G₂. 则下列判断正确的是（　　）

A	G₁＞G₂
B	G₁＜G₂
C	G₁=G₂
D	无法判断

正确答案：Qg==

PGRpdj7li7rlrZDlpITkuo7lubPooaHnirbmgIHvvIznlLHlm77lj6/nn6XvvIzlj7Pkvqfpg6jliIbph43lv4PnprvmlK/ngrlP6L6D6L+R77yM5pWF5Yqb6IeCT0bovoPlsI/vvIzlt6bkvqfpg6jliIbph43lv4PnprvmlK/ngrlP6L6D6L+c77yM5pWF5Yqb6IeCT0XovoPlpKfvvJs8YnI+5qC55o2u5p2g5p2G5bmz6KGh5p2h5Lu2RzxzdWI+MTwvc3ViPsOXT0U9RzxzdWI+Mjwvc3ViPsOXT0bvvIzlt6bkvqfli7rlrZDph43liptHPHN1Yj4xPC9zdWI+5bCP44CB5Y+z5L6n6YeN5YqbRzxzdWI+Mjwvc3ViPuWkp++8jDxicj7ljbPvvJpHPHN1Yj4xPC9zdWI+77ycRzxzdWI+Mjwvc3ViPi4gPC9kaXY+

3/5单选题

难度：

3.图是用羊角锤撬起钉子的示意图. 为了撬起钉子，分别用四个力作用在锤柄的末端，其中最小的力是（　　）

A	F₁
B	F₂
C	F₃
D	F₄

正确答案：RA==

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

4/5单选题

难度：

4.

如图所示，在建筑工地上经常看见塔吊，塔吊的横梁可以看成一根杠杆，塔吊在C处安装了较重的配重物，其主要目的是为了（　　）

A	美观
B	增大塔吊的阻力，确保塔吊不会翻倒
C	减小塔吊所吊物体的重力
D	增大塔吊的阻力臂

正确答案：Qg==

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

5/5单选题

难度：

5.自行车的脚踏板转到如图中，用力向下蹬的效果最好位置是（　　）

A
B
C
D

正确答案：QQ==

PGRpdj7kvZznlKjlnKjohJrouI/mnb/kuIrouaznmoTlipvvvIzmlrnlkJHlupTnq5bnm7TlkJHkuIvvvIzmlK/ngrnkuLrovazovbTlpITvvIzlvZPohJrouI/mnb/ovazliLDkuI7ovazovbTlnKjlkIzkuIDmsLTlubPpnaLkuIrml7bvvIzmi5Dohb/nmoTplb/miJDkuLrlipvoh4LvvIzmraTml7blipvoh4LmnIDlpKfvvIzohJrouI/nmoTlipvnmoTkvZznlKjmlYjmnpzlsIbmnIDlpb0uIDwvZGl2Pg==