本课配套习题挑战模式1/5
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+5qC856e75Yqo5LiA5Liq5bCP5qC85ZKM56e75Yqo55u45ZCM6Led56a757uT5p6c5piv55u45ZCM55qELjwvcD4=
- 提示2:PHA+5YeP5o6J5LiA5Liq6ZKp56CB5ZKM5YeP5o6J55u45ZCM6LSo6YeP57uT5p6c5piv55u45ZCM55qEPC9wPg==
- 提示3:PHA+5YiZ5Yqg5LiA5Liq6ZKp56CB5Y+v5Lul5oqK6L+Z5Liq6ZKp56CB55qE6LSo6YeP55yL5oiQ5peg56m35aSnPC9wPg==
- 答案:Qw==
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
本课配套习题挑战模式2/5
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:IOa7muWKqOmAn+W6puebuOWQjO+8jOebuOWQjOaXtumXtOWGhea7muWKqOi3neemu+ebuOWQjA==
- 提示2:IOWPr+S7peeci+aIkOWQkeWGheenu+WKqOebuOWQjOi3neemu++8jA==
- 提示3:IOeUqOaegemZkOazleWwseaYr+enu+WKqE9B55qE6ZW/5bqm
- 答案:Qg==
PGRpdj7mu5rliqjpgJ/luqbnm7jlkIzvvIznm7jlkIzml7bpl7TlhoXmu5rliqjot53nprvnm7jlkIzvvIzlj6/ku6XnnIvmiJDlkJHlhoXnp7vliqjnm7jlkIzot53nprvvvIznlKjmnoHpmZDms5XlsLHmmK/np7vliqhPQeeahOmVv+W6puOAguW3puerr+WKm+iHguWPmOS4ujDvvIzmiYDku6Xlj7Pnq6/kuIvpmY08L2Rpdj4=
本课配套习题挑战模式3/5
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:PHA+5Y+W5o6J55u45ZCM6LSo6YeP55qE54mp5L2T77yM6LSo6YeP5aSn5bCP55Sx5oiR5Lus5Yaz5a6aPC9wPg==
- 提示2:PHA+5Y+W5o6J55qE6LSo6YeP5q2j5aW95pivRzHnmoTotKjph4/jgII8L3A+
- 提示3:PHA+5YiZ5bem56uv6LSo6YeP5Li6MO+8jOWPs+err+acieWJqeS9meOAgjwvcD4=
- 答案:RA==
PGRpdj7lj5bmjonnm7jlkIzotKjph4/nmoTniankvZPvvIzotKjph4/lpKflsI/nlLHmiJHku6zlhrPlrprvvIzlj5bmjonnmoTotKjph4/mraPlpb3mmK9HMeeahOi0qOmHj+OAguWImeW3puerr+i0qOmHj+S4ujDvvIzlj7Pnq6/mnInliankvZnjgILlj7Pnq6/kuIvpmY3jgILlj7Pnq6/kuIvpmY3vvIzkuLrkvb/mnaDmnYbph43mlrDlubPooaHvvIzmlK/ngrnopoHmg7Plj7Pnp7vliqjvvIzlop7liqDlt6bnq6/lipvoh4LvvIzlh4/lsI/lj7Pnq6/lipvoh4LjgII8YnI+PC9kaXY+
本课配套习题挑战模式4/5
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+5aKe5Yqg55u4562J6LSo6YeP5Y+v5Lul55yL5oiQ5aKe5Yqg5peg56m35aSnPC9wPg==
- 提示2:PHA+5YeP5bCP55u45ZCM5L2T56ev5Y+v5Lul55yL5oiQ5oqK5pyA5bCP5L2T56ev54mp5L2T5YWo6YOo5Ymq5o6JPC9wPg==
- 提示3:PHA+5ZCM5pe25ZCR5pSv54K556e75Yqo55u45ZCM6Led56a777yM5Y+v5Lul55yL5oiQ56e75Yqo5pyA55+t5Yqb6IeC6Led56a7PC9wPg==
- 答案:Qg==
PGRpdj7lop7liqDnm7jnrYnotKjph4/lj6/ku6XnnIvmiJDlop7liqDml6DnqbflpKfvvIzlh4/lsI/nm7jlkIzkvZPnp6/lj6/ku6XnnIvmiJDmiormnIDlsI/kvZPnp6/niankvZPlhajpg6jliarmjonvvIzlkIzml7blkJHmlK/ngrnnp7vliqjnm7jlkIzot53nprvvvIzlj6/ku6XnnIvmiJDnp7vliqjmnIDnn63lipvoh4Lot53nprvjgII8L2Rpdj4=
本课配套习题挑战模式5/5
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+5YGH6K6+5YeP5Y675LiA5Y2K77yM5bem56uv5LiL6ZmN77yM6YKj5LmI5YeP5Y675YWo6YOo5bem56uv5LiL6ZmN5bCx5Lya5pu05piO5pi+44CCPGJyPjwvcD4=
- 提示2:PHA+5omA5Lul5Y+v5Lul55So5p6B6ZmQ5rOV77yM5YGH6K6+5YWo6YOo5Ymq5o6J44CCPC9wPg==
- 提示3:PHA+5Yqb6YO95Y+Y5Li6MO+8jOaJgOS7peadoOadhui/mOW5s+ihoeOAgjwvcD4=
- 答案:Qw==
PGRpdj7lpoLmnpzlh4/ljrvkuIDljYrvvIzlt6bnq6/kuIvpmY3vvIzpgqPkuYjlh4/ljrvlhajpg6jlt6bnq6/kuIvpmY3lsLHkvJrmm7TmmI7mmL7jgILmiYDku6Xlj6/ku6XnlKjmnoHpmZDms5XvvIzlgYforr7lhajpg6jliarmjonjgIIg5Yqb6YO95Y+Y5Li6MO+8jOaJgOS7peadoOadhui/mOW5s+ihoeOAgjwvZGl2Pg==