中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.
人类日常生活离不开摩擦力，如果没有摩擦力，我们将不能走路、汽车不能运动…下列关于摩擦力的说法中正确的是（ ）
| A: 吃饭时拿在手中的筷子不会滑落，是因为有摩擦力的作用 |
| B: 汽车轮胎表面都有花纹，是为了减小摩擦 |
| C: 猴子沿竖直竹竿匀速上爬，是因为摩擦力大于猴子重力 |
| D: 在结冰的水平路面上洒些细土，人走上去不易滑倒，是因为此时人与路面间的静摩擦力减小了 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5ZCD6aWt5pe25ou/5Zyo5omL5Lit55qE56235a2Q5Zug5Li65pyJ5pGp5pOm5Yqb55qE5L2c55So6ICM5LiN5Lya5ruR6JC9LiDmsb3ovabova7og47ooajpnaLpg73mnInoirHnurnvvIzmmK/kuLrkuoblop7lpKfmkanmk6bvvJvnjLTlrZDmsr/nq5bnm7Tnq7nnq7/ljIDpgJ/kuIrniKzvvIzmmK/lm6DkuLrmkanmk6blipvnrYnkuo7njLTlrZDph43lipsuIOWcqOe7k+WGsOeahOawtOW5s+i3r+mdouS4iua0kuS6m+e7huWcn++8jOS6uuS4jui3r+mdoumXtOeahOmdmeaRqeaTpuWKm+WinuWkp++8jOS6uui1sOS4iuWOu+S4jeaYk+a7keWAkjwvcD4=
- 答案：QQ==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
关于摩擦力，下列说法正确的（ ）
| A: 摩擦力的方向一定和物体的运动方向相反 |
| B: 摩擦力一定阻碍物体的运动，所以它总是阻力 |
| C: 摩擦力既可作为阻力，有时也能当作动力 |
| D: 我们常用增大压力的办法来增大静摩擦力 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5pGp5pOm5Yqb5a6a5LmJ5piv5Lik5Liq5LqS55u45o6l6Kem55qE54mp5L2T77yM5b2T5a6D5Lus6KaB5Y+R55Sf5oiW5bey57uP5Y+R55Sf55u45a+56L+Q5Yqo5pe277yM5bCx5Lya5Zyo5o6l6Kem6Z2i5LiK5Lqn55Sf5LiA56eN6Zi756KN55u45a+56L+Q5Yqo55qE5Yqb77yM6L+Z56eN5Yqb5bCx5Y+r5YGa5pGp5pOm5YqbPGJyPjwvcD4=
- 答案：Qw==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.
下列情况中，物体不受摩擦力的是（ ）
| A: 小车静止放在水平地面上 |
| B: 木块静止放在斜坡上 |
| C: 货物随传送带一起斜向上匀速运动 |
| D: 足球在地面上滚动 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5Lqn55Sf5pGp5pOm5Yqb55qE5p2h5Lu25piv77ya5Lik5Liq5LqS55u45o6l6Kem55qE54mp5L2T77yM5b2T5a6D5Lus5YGa55u45a+56L+Q5Yqo5oiW5pyJ5LiA5Liq55u45a+56L+Q5Yqo55qE6LaL5Yq/5pe277yM5Zyo5o6l6Kem6Z2i5LiK5Lya5Lqn55Sf5LiA56eN6Zi756KN55u45a+56L+Q5Yqo55qE5Yqb77yM6L+Z5bCx5Y+v5Lul5Lqn55Sf5pGp5pOm5YqbPC9wPg==
- 答案：QQ==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.
如图所示，各物体不受摩擦力的是（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5Lik5Liq54mp5L2T55u45LqS5o6l6Kem5pe277yM6KaB5Y+R55Sf5oiW5bey57uP5Y+R55Sf55u45a+56L+Q5Yqo5pe277yM5Zyo5o6l6Kem6Z2i5LiK5Lqn55Sf5LiA56eN6Zi756KN54mp5L2T55u45a+56L+Q5Yqo55qE5Yqb5bCx5piv5pGp5pOm5YqbPGJyPjwvcD4=
- 答案：QQ==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.
关于摩擦力，下面说法正确的是（ ）
| A: 相互压紧的粗糙物体之间总是有摩擦力 |
| B: 一个物体只有跟另一个物体表面压紧，并有相对运动或发生相对运动趋势时才有可能受到摩擦力 |
| C: 发生相对运动的两个物体，一定存在摩擦力 |
| D: 只有静止的物体，才受到静摩擦力的作用 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5pGp5pOm5Yqb5Lqn55Sf55qE5p2h5Lu25piv77ya4pGg55u45LqS5o6l6Kem5bm25oyk5Y6L77yM5LiU5o6l6Kem6Z2i57KX57OZ77yb4pGh6KaB5Y+R55Sf5oiW5bey57uP5Y+R55Sf55u45a+56L+Q5YqoPGJyPjwvcD4=
- 答案：Qg==
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
