配套习题-抽象杠杆问题 -【青果学院】

本课配套习题挑战模式1/5

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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

提示1：IOacgOecgeWKm++8jOWKm+iHguW6lOivpeacgOWkp+OAgg==
提示2：IOS5meeahOWKm+iHguWkp+S6jueUsuWbvuWKm+iHgg==
提示3：IOWmguaenOWGjeS4jeS8mu+8jOmHjeaWsOeci+eci+ivvueoiw==
答案：Qg==
PGRpdj7nlLHmnaDmnYbnmoTlubPooaHmnaHku7ZGPHN1Yj4xPC9zdWI+TDxzdWI+MTwvc3ViPj1GPHN1Yj4yPC9zdWI+TDxzdWI+Mjwvc3ViPuWPr+efpe+8jOmYu+WKm+iHgkw8c3ViPjI8L3N1Yj7lkozpmLvliptGPHN1Yj4yPC9zdWI+5LiN5Y+Y77yMRjxzdWI+MTwvc3ViPuWSjEw8c3ViPjE8L3N1Yj7miJDlj43mr5TvvIxMPHN1Yj4xPC9zdWI+6LaK6ZW/6LaK55yB5YqbLiDlpoLkuZnlm77miYDnpLrvvIzmiormiYvlsL3ph4/lvoDmibPmiYvmn4TnmoTov5zlpITnp7vliqjvvIzlop7lpKfkuobliqjlipvoh4JMPHN1Yj4xPC9zdWI+77yM5bCx5Lya6LaK55yB5YqbLiA8L2Rpdj4=

本课配套习题挑战模式2/5

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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

提示1：IOWLuuWtkOWPr+S7peeci+aIkOS4gOS4quadoOadhu+8jOaUr+eCueaYr+aJi+aMh+WktA==
提示2：IOWIpOaWrUc8c3ViPjE8L3N1Yj5HPHN1Yj4yPC9zdWI+5aSn5bCP55qE5pa55byP5piv5Yik5pat5LuW5Lus55qE5Yqb6IeC
提示3：IOWPr+S7peaDs+aDs+WFlOWtkOWIhuiDoeiQneWNnO+8jOaIluiAheaYr+WEv+WtkOWIhumHkeWtkA==
答案：Qg==
PGRpdj7li7rlrZDlpITkuo7lubPooaHnirbmgIHvvIznlLHlm77lj6/nn6XvvIzlj7Pkvqfpg6jliIbph43lv4PnprvmlK/ngrlP6L6D6L+R77yM5pWF5Yqb6IeCT0bovoPlsI/vvIzlt6bkvqfpg6jliIbph43lv4PnprvmlK/ngrlP6L6D6L+c77yM5pWF5Yqb6IeCT0XovoPlpKfvvJs8YnI+5qC55o2u5p2g5p2G5bmz6KGh5p2h5Lu2RzxzdWI+MTwvc3ViPsOXT0U9RzxzdWI+Mjwvc3ViPsOXT0bvvIzlt6bkvqfli7rlrZDph43liptHPHN1Yj4xPC9zdWI+5bCP44CB5Y+z5L6n6YeN5YqbRzxzdWI+Mjwvc3ViPuWkp++8jDxicj7ljbPvvJpHPHN1Yj4xPC9zdWI+77ycRzxzdWI+Mjwvc3ViPi4gPC9kaXY+

本课配套习题挑战模式3/5

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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

提示1：IOi/memimOacieeCuemavu+8jOWKm+eahOaWueWQkeS4jeWQjOaUr+eCueacieS4pOS4quOAgg==
提示2：IOaWveWKoOWKm0Y8c3ViPjI8L3N1Yj7jgIFGPHN1Yj4zPC9zdWI+44CBRjxzdWI+NDwvc3ViPuaXtu+8jOaYr+WQjOS4gOS4quaUr+eCuQ==
提示3：IOaWveWKoEY8c3ViPjE8L3N1Yj7ml7bvvIzmlK/ngrnlj5HnlJ/lj5jljJY=
答案：RA==
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

本课配套习题挑战模式4/5

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难度系数：

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

提示1：PHA+6K6+6K6h55qE6L+Z5LmI6Zq+55yL77yM6L+Y6IO95Zyo6Zq+55yL54K55LmIPC9wPg==
提示2：PHA+6YeN54mp5b6I6YeN77yM5Yqb6IeC5b6I55+tPC9wPg==
提示3：PHA+5aGU5ZCK6IO95o+Q6LW35b6I6YeN55qE54mp5L2T77yM5bCx5piv5Zug5Li65Li65LqG5ZCK6LW36YeN54mp5L2T5LiN5Lya5YC+5YCS44CCPGJyPjwvcD4=
答案：Qg==
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

本课配套习题挑战模式5/5

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难度系数：

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:

提示1：IOacgOecgeWKm++8jOWKm+iHguacgOWkpw==
提示2：IOWKm+eahOaWueWQkeWni+e7iOWQkeS4i++8jOaUr+eCueaYr+i4j+adv+S4reW/g+i9tA==
提示3：IOawtOW5s+aYr+WKm+iHguacgOWkp+OAgg==
答案：QQ==
PGRpdj7kvZznlKjlnKjohJrouI/mnb/kuIrouaznmoTlipvvvIzmlrnlkJHlupTnq5bnm7TlkJHkuIvvvIzmlK/ngrnkuLrovazovbTlpITvvIzlvZPohJrouI/mnb/ovazliLDkuI7ovazovbTlnKjlkIzkuIDmsLTlubPpnaLkuIrml7bvvIzmi5Dohb/nmoTplb/miJDkuLrlipvoh4LvvIzmraTml7blipvoh4LmnIDlpKfvvIzohJrouI/nmoTlipvnmoTkvZznlKjmlYjmnpzlsIbmnIDlpb0uIDwvZGl2Pg==

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