本课配套习题挑战模式1/5
关于滑动摩擦力的大小,下列说法中正确的是( )
A: 只与压力大小有关 |
B: 只与接触面的粗糙程度有关 |
C: 与物体的重力大小和接触面的粗糙程度有关 |
D: 与压力大小和接触面的粗糙程度有关 |
- 提示1:PHA+54mp5L2T5omA5Y+X5ruR5Yqo5pGp5pOm5Yqb55qE5aSn5bCP5LiO54mp5L2T5omA5Y+X5q2j5Y6L5Yqb5aSn5bCP77yM5Lul5Y+K5o6l6Kem6Z2i55qE57KX57OZ56iL5bqm5pyJ5YWzPC9wPg==
- 答案:RA==
PGRpdj7mu5Hliqjmkanmk6blipvnmoTlpKflsI/kuI7mraPljovlipvnmoTlpKflsI/lkozmjqXop6bpnaLnmoTnspfns5nnqIvluqbmnInlhbPvvIzliJlBQumUmeivr++8jETmraPnoa7vvJvniankvZPmiYDlj5fmkanmk6blipvlj6/og73kuI7ph43lipvlpKflsI/ml6DlhbPvvIxD6ZSZ6K+vPGJyPjwvZGl2Pg==
本课配套习题挑战模式2/5
下列情况中,属于增大摩擦的是( )
A: 向结冰路面撒渣土 |
B: 给自行车车轴上加润滑油 |
C: 在笨重的箱子下装上轮子 |
D: 自行车轴间用滚珠 |
- 提示1:PHA+5aKe5aSn5pGp5pOm5Yqb55qE5pa55rOV5pyJ5Lik56eN77yaMeOAgeWinuWkp+eJqeS9k+aJgOWPl+ato+WOi+WKm++8mzLjgIHlop7lpKfmjqXop6bpnaLnmoTnspfns5nnqIvluqY8YnI+PC9wPg==
- 答案:QQ==
PGRpdj7lop7lpKfmkanmk6blipvnmoTmlrnms5XmnInkuKTnp43vvJox44CB5aKe5aSn54mp5L2T5omA5Y+X5q2j5Y6L5Yqb77ybMuOAgeWinuWkp+aOpeinpumdoueahOeyl+ezmeeoi+W6pu+8m0HpgInpobnmmK/pgJrov4flop7lpKfmjqXop6bpnaLnmoTnspfns5nnqIvluqbmnaXlop7lpKfmkanmk6blipvvvIzogIxCQ0TpgInpobnmmK/lh4/lsI/mkanmk6blips8L2Rpdj4=
本课配套习题挑战模式3/5
A: 拉链不好拉时,可在拉链上抹一点蜡 |
B: 移动较重的货箱时,在货箱的下面垫上几根圆木 |
C: 提起酒瓶时,用手紧握瓶颈 |
D: 磁悬浮列车行驶时,车身悬在空中 |
- 提示1:CiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg54mp5L2T5omA5Y+X5ruR5Yqo5pGp5pOm5Yqb55qE5aSn5bCP5LiO54mp5L2T5omA5Y+X5q2j5Y6L5Yqb5aSn5bCP77yM5Lul5Y+K5o6l6Kem6Z2i55qE57KX57OZ56iL5bqm5pyJ5YWzCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA=
- 答案:Qw==
QemAiemhueaYr+WwhuaOpeinpumdoueahOeyl+ezmeeoi+W6puWPmOWwj+S7juiAjOi+vuWIsOWHj+Wwj+aRqeaTpuWKm+eahOebrueahO+8m0LpgInpobnlsIbmu5Hliqjmkanmk6blj5jmu5rliqjmkanmk6bvvIzmkanmk6blipvlh4/lsI/vvJtD5o+Q6LW36YWS55O25pe277yM5aKe5aSn5q2j5Y6L5Yqb77yM5YiZ5pGp5pOm5Yqb5aKe5aSn77ybROi9puaCrOa1ru+8jOaOpeinpumdoueahOeyl+ezmeeoi+W6puWHj+Wwj++8jOaRqeaTpuWKm+WHj+WwjzxkaXY+PC9kaXY+
本课配套习题挑战模式4/5
下列关于摩擦力说法错误的是( )
A: 缝衣针表面做得很光滑是为了减少摩擦力 |
B: 自行车刹车,利用了增大压力的办法来增大摩擦 |
C: 鞋底上的花纹是为了增大鞋底与地面间的摩擦力 |
D: 用铅笔写字,笔尖与纸间的摩擦属于滚动摩擦 |
- 提示1:PHA+55So6ZOF56yU5YaZ5a2X77yM56yU5bCW5LiO57q46Ze055qE5pGp5pOm5bGe5LqO5ruR5Yqo5pGp5pOm5YqbPGJyPjwvcD4=
- 答案:RA==
PHA+QemAiemhueaYr+mAmui/h+WHj+Wwj+aOpeinpumdoueahOeyl+ezmeeoi+W6puadpeWHj+Wwj+aRqeaTpuWKm++8m0LpgInpobnmmK/lop7lpKfmraPljovlipvvvIzku47ogIzlop7lpKfmkanmk6blipvvvJtD6YCJ6aG55piv6YCa6L+H5aKe5aSn5o6l6Kem6Z2i55qE57KX57OZ56iL5bqm5p2l5aKe5aSn5pGp5pOm5Yqb77ybROmTheeslOWGmeWtl+aYr+WxnuS6jua7keWKqOaRqeaTpuWKmzxicj48L3A+
本课配套习题挑战模式5/5
关于摩擦力,下列说法中错误的是( )
A: 滑动摩擦力的大小跟物体间的压力和接触面的粗糙程度有关 |
B: 在相同条件下,滚动摩擦比滑动摩擦小 |
C: 在任何情况下摩擦力总是有害的 |
D: 轮胎上有凹凸不平的花纹,是为了增大摩擦 |
- 提示1:PHA+5pGp5pOm5Yqb5Y+v6IO95piv5pyJ5a6z55qE77yM5Y+v6IO95piv5pyJ55uK55qEPC9wPg==
- 答案:Qw==
PGRpdj7mu5Hliqjmkanmk6blipvnmoTlpKflsI/ot5/niankvZPpl7TnmoTljovlipvlkozmjqXop6bpnaLnmoTnspfns5nnqIvluqbmnInlhbPvvIxB5q2j56Gu77yb5Zyo55u45ZCM5p2h5Lu25LiL77yM5rua5Yqo5pGp5pOm5q+U5ruR5Yqo5pGp5pOm5bCP77yMQuato+ehru+8m+aRqeaTpuWKm+WPr+iDveaYr+acieWus+eahO+8jOS5n+WPr+iDveaYr+acieebiueahO+8jEPplJnor6/vvJvova7og47kuIrmnInlh7nlh7jkuI3lubPnmoToirHnurnvvIzlop7lpKfkuobmjqXop6bpnaLnmoTnspfns5nnqIvluqbvvIzmmK/kuLrkuoblop7lpKfmkanmk6blipvvvIxE5q2j56GuPGJyPjwvZGl2Pg==