1/5单选题
难度：
1.
如图所示，杠杆在水平位置处于平衡状态，杠杆上每格均匀等距，每个都相同. 下列四项操作中，会使杠杆右端下倾的是（ ）
①将杠杆两侧的钩码同时各向外移动一小格
②将杠杆两侧的钩码同时各向内移动一小格
③在杠杆的两侧同时各减掉一个钩码
④在杠杆的两侧钩码下同时各加挂一个相同的钩码.
| A | ②③ |
| B | ②④ |
| C | ①③ |
| D | ①④ |
- 提示1：
- PHA+6K6+5q+P5Liq56Cd56CB6YeN6YeP5pivMe+8jOavj+S4quWwj+agvOmXtOi3neS5n+aYrzEuPC9wPg==
- 提示2：
- PHA+5bem5L6n56Cd56CB6YeN6YeP5LmY5Lul5qC85pWw5LiO5Y+z5L6n56Cd56CB6YeN6YeP5ZKM5qC85pWw5L2c5q+U6L6DPC9wPg==
- 提示3：
- PHA+5Y+z5L6n5LiL6ZmN77yM5bqU6K+l5piv5Y+z5L6n56Cd56CB6YeN6YeP5LmY5Lul5qC85pWw5aSn5LqO5bem5L6n56Cd56CB6YeN6YeP5LmY5Lul5qC85pWwPC9wPg==
正确答案：Qw==
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
2/5单选题
难度：
2.如图所示，杠杆水平平衡. 当两球同时以相同的速度向O点滚动时. （其中M1＞M2）杠杆（ ）
| A | 保持平衡 |
| B | 右边下偏 |
| C | 左边下偏 |
| D | 三种情况都有可能 |
- 提示1：
- IOiuvk08c3ViPjE8L3N1Yj49M++8jE08c3ViPjI8L3N1Yj49MuWQkeWGhea7muWKqOeahOi3neemu+aYrzE=
- 提示2：
- IOagueaNruW5s+ihoe+8jOacgOWInU9BPTIgLDBCPTPvvIznp7vliqjlkI7vvIxPPGltZyB3aWR0aD0xMyBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMC84Ny9yQkFDRkZNTVpIbVFpV3NPQUFBQlVqcFJpM1kzMjQucG5nIj49Me+8jE88aW1nIHdpZHRoPTE0IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzIzLzc2L3JCQUNFMU1NWkhtZ19jUnhBQUFCUERlb2xLODc1MC5wbmciPj0y77yM
- 提示3：
- 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
正确答案：Qg==
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
3/5单选题
难度：
3.如图，杠杆在水平位置平衡，若在杠杆两端各取掉相同质量的物体，则：（ ）
| A | 杠杆左端下降；把支点向左移动，可使杠杆平衡 |
| B | 杠杆左端下降；把支点向右移动，可使杠杆平衡； |
| C | 杠杆右端下降；把支点向左移动，可使杠杆平衡 |
| D | 杠杆右端下降；把支点向右移动，可使杠杆平衡 |
- 提示1：
- IOiuvkcxPTLvvIxHMj0z77yM5YiZT0E9M++8jE9CPTI=
- 提示2：
- IOiuvuWPluaOiei0qOmHj+S4ujE=
- 提示3：
- IOmAmui/h+S7o+aVsOiuoeeul++8jOeci+S4pOmBjeWkp+Wwj+WFs+ezuw==
正确答案：RA==
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
4/5单选题
难度：
4.
在轻质的杠杆两端AB各挂有体积相同的铜块和铝块（ρ铜＞ρ铝）. 支点O在如图所示的位置时，杠杆在水平位置保持平衡，在下列情况下杠杆仍能在水平位置保持平衡的是（ ）
| A | 在铜块和铝块上各加一块质量相等的物体 |
| B | 将铜块和铝块各切去体积相同的一小部分 |
| C | 将铜块和铝块同时向支点移动一段相同的距离 |
| D | 将铜块和铝块同时浸没在水中 |
- 提示1：
- PHA+6K6+6ZOc55qE6LSo6YeP5pivM++8jOmTneeahOi0qOmHj+aYrzLjgILliJlPQT0y77yMT0I9MzwvcD4=
- 提示2：
- PHA+5a+55bqU55qE5q+P5Liq6YCJ6aG56K6+55u45bqU5pWw5YC85pivMS48L3A+
- 提示3：
- PHA+6YCa6L+H5Luj5pWw55yL5p2g5p2G5piv5ZCm5bmz6KGhPC9wPg==
正确答案：Qg==
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
5/5单选题
难度：
5.
如图所示，一杠杆在三个大小相同的力F作用下保持平衡，如果将力F均减小一半，则该杠杆将：
（ ）
| A | 向左倾斜 |
| B | 向右倾斜 |
| C | 仍旧平衡 |
| D | 无法确定 |
- 提示1：
- PHA+6K6+5q+P5Liq5Yqb6YO95pivMe+8jE9CPTHvvIxPQT0y77yM5Y+v5Lul566X5Ye6T0M9MzwvcD4=
- 提示2：
- PHA+5Yqb6YO95YeP5Y2K77yM5Y+Y5oiQMC41PC9wPg==
- 提示3：
- 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
正确答案：Qw==
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