本课配套习题挑战模式1/5
关于摩擦力的方向,下列说法中正确的是( )
A: 摩擦力的方向总是和物体运动的方向相反 |
B: 滑动摩擦力的方向可能和物体运动的方向相同 |
C: 物体所受摩擦力的方向总是和接触面垂直 |
D: 物体受的摩擦力的方向总是和物体的相对运动或相对运动趋势的方向相同 |
- 提示1:PHA+6Z2Z5q2i55qE54mp5L2T5pei5Y+v5Lul5Y+X5ruR5Yqo5pGp5pOm5Yqb5Lmf5Y+v5Lul5Y+X6Z2Z5pGp5pOm5Yqb77yM5ruR5Yqo55qE54mp5L2T5pei5Y+v5Lul5Y+X5ruR5Yqo5pGp5pOm5Yqb5Lmf5Y+v5Lul5Y+X6Z2Z5pGp5pOm5Yqb77ybPC9wPg==
- 提示2:PHA+5pGp5pOm5Yqb55qE5pa55ZCR5LiO55u45a+56L+Q5Yqo55qE5pa55ZCR5oiW55u45a+56L+Q5Yqo55qE6LaL5Yq/55qE5pa55ZCR55u45Y+N77yM5LiO6L+Q5Yqo5pa55ZCR5Y+v5Lul55u45ZCM5Lmf5Y+v5Lul55u45Y+N77yM5Lmf5Y+v5Lul5Z6C55u077yM5Lmf5Y+v5Lul5piv5YW25LuW6KeS5bqmPC9wPg==
- 答案:Qg==
PGRpdj7mkanmk6blipvnmoTmlrnlkJHkuI7nm7jlr7nov5DliqjnmoTmlrnlkJHmiJbnm7jlr7nov5DliqjnmoTotovlir/nmoTmlrnlkJHnm7jlj43vvIzkuI7ov5DliqjmlrnlkJHlj6/ku6Xnm7jlkIzkuZ/lj6/ku6Xnm7jlj43vvIzkuZ/lj6/ku6XlnoLnm7TvvIzkuZ/lj6/ku6XmmK/lhbbku5bop5LluqbvvIzliJlC5q2j56Gu77yMQUNE6ZSZ6K+v77ybPGJyPjwvZGl2Pg==
本课配套习题挑战模式2/5
关于摩擦力的方向,下列叙述中不正确的是( )
A: 静摩擦力的方向,可能与物体运动的方向相同 |
B: 静摩擦力的方向总是跟物体相对运动趋势的方向相反 |
C: 滑动摩擦力的方向,可能与物体的运动方向相同 |
D: 滑动摩擦力的方向,总是与物体的相对运动方向相同 |
- 提示1:PHA+6Z2Z5pGp5pOm5Yqb55qE5pa55ZCR5LiO55u45a+56L+Q5Yqo6LaL5Yq/55qE5pa55ZCR55u45Y+N77yM5L2G5piv5Y+v6IO95LiO6L+Q5Yqo5pa55ZCR55u45ZCM5oiW55u45Y+NPGJyPjwvcD4=
- 提示2:PHA+5ruR5Yqo5pGp5pOm5Yqb55qE5pa55ZCR5LiO55u45a+56L+Q5Yqo55qE5pa55ZCR55u45Y+N77yM5L2G5piv5Y+v6IO95LiO6L+Q5Yqo5pa55ZCR55u45ZCM5oiW55u45Y+NPGJyPjwvcD4=
- 答案:RA==
PHA+6Z2Z5pGp5pOm5Yqb55qE5pa55ZCR5Y+v6IO95LiO54mp5L2T6L+Q5Yqo55qE5pa55ZCR55u45ZCM77yM5Lmf5Y+v6IO955u45Y+N77yMQeato+ehru+8m+mdmeaRqeaTpuWKm+eahOaWueWQkeS4jueJqeS9k+ebuOWvuei/kOWKqOi2i+WKv+eahOaWueWQkeebuOWPje+8jELmraPnoa7vvJvmu5Hliqjmkanmk6blipvnmoTmlrnlkJHlj6/og73kuI7ov5DliqjnmoTmlrnlkJHnm7jlkIzkuZ/lj6/og73nm7jlj43vvIxD5q2j56Gu77ybROmUmeivrzwvcD4=
本课配套习题挑战模式3/5
关于摩擦力的方向下列说法中正确的是( )
A: 摩擦力的方向一定和物体的运动方向相反 |
B: 摩擦力的方向一定和物体的运动方向在同一条直线上 |
C: 摩擦力的方向可能和两物体间相对运动的方向垂直 |
D: 摩擦力的方向可能和物体的运动方向垂直 |
- 提示1:PHA+5pGp5pOm5Yqb5a6a5LmJ5piv5Lik5Liq5LqS55u45o6l6Kem55qE54mp5L2T77yM5b2T5a6D5Lus6KaB5Y+R55Sf5oiW5bey57uP5Y+R55Sf55u45a+56L+Q5Yqo5pe277yM5bCx5Lya5Zyo5o6l6Kem6Z2i5LiK5Lqn55Sf5LiA56eN6Zi756KN55u45a+56L+Q5Yqo55qE5Yqb77yM6L+Z56eN5Yqb5bCx5Y+r5YGa5pGp5pOm5YqbPGJyPjwvcD4=
- 提示2:PHA+5pGp5pOm5Yqb5pei5Y+v5Lul5L2c5Li65Yqo5Yqb5Lmf5Y+v5Lul5L2c5Li66Zi75Yqb77yM5b2T5pGp5pOm5Yqb5YGa5Li65Yqo5Yqb5pe25pa55ZCR5ZKM54mp5L2T55qE6L+Q5Yqo5pa55ZCR55u45ZCM77yM6ICM5YGa5Li66Zi75Yqb5pe25pa55ZCR5ZKM54mp5L2T55qE6L+Q5Yqo5pa55ZCR55u45Y+NPGJyPjwvcD4=
- 提示3:PHA+5pGp5pOm5Yqb55qE5pa55ZCR5Lmf5Y+v6IO95LiO6L+Q5Yqo5pa55ZCR5Z6C55u0PGJyPjwvcD4=
- 答案:RA==
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
本课配套习题挑战模式4/5
皮带运输机把物体匀速送经高处时,物体受到的摩擦力的方向( )
A: 与物体速度同向 |
B: 与物体速度反向 |
C: 摩擦力为零 |
D: 因不知相对运动趋势,故不能判定 |
- 提示1:PHA+55qu5bim6L+Q6L6T5py65oqK54mp5L2T5YyA6YCf6YCB57uP6auY5aSE5pe277yM54mp5L2T5Y+X5Yqb5bmz6KGh77yM5YiG5p6Q54mp5L2T5Y+X5Yqb5oOF5Ya177yM55Sx5bmz6KGh5p2h5Lu25YiG5p6Q54mp5L2T5Y+X5Yiw55qE5pGp5pOm5Yqb55qE5pa55ZCRPGJyPjwvcD4=
- 答案:QQ==
PGRpdj7nmq7luKbov5DovpPmnLrmiorniankvZPljIDpgJ/pgIHnu4/pq5jlpITml7bvvIzniankvZPlj5flipvlubPooaHvvIzliIbmnpDniankvZPlj5flipvmg4XlhrXvvIznlLHlubPooaHmnaHku7bliIbmnpDniankvZPmmK/nlLHkuo7lj5fliLDmkanmk6blipvmiY3kvJrlkJHkuIrov5DliqjvvIzmkanmk6blipvmlrnlkJHkuI7ov5DliqjmlrnlkJHnm7jlkIw8YnI+PC9kaXY+
本课配套习题挑战模式5/5
关于摩擦力以下几种说法你认为正确的是( )①摩擦力的方向总是与物体的运动方向共线;②滑动摩擦力总是阻碍物体之间的相对运动;③摩擦力做功总是使物体的机械能减小;④滑动摩擦力做功肯定能生热、使物体内能增加
A: ①和③是正确的 |
B: ②和③是正确的 |
C: ②和④是正确的 |
D: 只有②是正确的 |
- 提示1:PHA+5pGp5pOm5Yqb55qE5pa55ZCR5Y+v6IO95LiO54mp5L2T55qE6L+Q5Yqo5pa55ZCR5YWx57q/77yM5Lmf5Y+v6IO95LiN5YWx57q/LiDmu5Hliqjmkanmk6blipvmgLvmmK/pmLvnoo3niankvZPkuYvpl7TnmoTnm7jlr7nov5DliqguIOaRqeaTpuWKm+WBmuWKn+WPr+iDveS9v+eJqeS9k+eahOacuuaisOiDveWHj+Wwj++8jOS5n+WPr+iDveWinuWkpy4g5ruR5Yqo5pGp5pOm5Yqb5YGa5Yqf6IKv5a6a6IO955Sf54Ot44CB5L2/54mp5L2T5YaF6IO95aKe5YqgPC9wPg==
- 答案:Qw==
PGRpdj7mkanmk6blipvnmoTmlrnlkJHlj6/og73kuI7niankvZPnmoTov5DliqjmlrnlkJHlhbHnur/vvIzkuZ/lj6/og73kuI3lhbHnur/jgILmu5Hliqjmkanmk6blipvmgLvmmK/pmLvnoo3niankvZPkuYvpl7TnmoTnm7jlr7nov5DliqjjgIIg5pGp5pOm5Yqb5YGa5Yqf5Y+v6IO95L2/54mp5L2T55qE5py65qKw6IO95YeP5bCP77yM5Lmf5Y+v6IO95aKe5aSnLiDmu5Hliqjmkanmk6blipvlgZrlip/ogq/lrprog73nlJ/ng63jgIHkvb/niankvZPlhoXog73lop7liqDvvIzliJlD6YCJ6aG55q2j56GuPC9kaXY+