Lisa's birthday is on October 18th. It's on Wednesday. She is going to have a birthday party. She wants to invite Peter, Gao Wei and Li Yan to her birthday party. They can celebrate after school. Today Lisa's parents go shopping with Lisa. They want to buy a My dream is to work in a hospital.I think that a(n) __1__ is one of the most important jobs in the world.__2__ people are busy working every day牛顿第一定律
第1课时 牛顿第一定律 (用时:8 min 满分:10分)
1.(2分)关于牛顿第一定律,下列说法正确的是(C) A.牛顿第一定律是可以通过实验直接证明的
B.验证牛顿第一定律的实验做不出来,因此不能肯定这个定律是否正确 C.牛顿第一定律是在大量实验的基础上通过分析推理而获得的 D.物体保持静止或匀速直线运动的状态叫做牛顿第一定律
2.(2分)在学习牛顿第一定律时,我们做了如图所示的实验。下列有关叙述正确的是(C)
A.每次实验时,小车可以从斜面上的不同位置由静止开始下滑 B.实验表明:小车受到的阻力越小,小车运动的距离就越近 C.实验中运动的小车会停下来,说明力能改变物体的运动状态 D.根据甲、乙、丙的实验现象,就可以直接得出牛顿第一定律
3.(2分)伽利略通过实验表明:物体的运动__不需要__(选填“需要”或“不需要”)力来维持,运动的物体之所以会停下来,是因为受到了__阻力__。
4.(4分)某同学利用如图所示装置研究阻力对物体运动的影响。甲、乙木板上分别铺有毛巾和棉布,丙木板上不铺任何材料,让小车从相同斜面的顶端由静止开始滑下,观察现象。
试回答下列问题:
(1)科学实验需要控制变量。本实验中,影响小车在水平面上运动距离的因素,除了阻力外,还有__小车在水平面上开始运动时的速度__,该因素可以采用小车从相同斜面的顶端由静止开始滑下的方法来控制。
Lisa's birthday is on October 18th. It's on Wednesday. She is going to have a birthday party. She wants to invite Peter, Gao Wei and Li Yan to her birthday party. They can celebrate after school. Today Lisa's parents go shopping with Lisa. They want to buy a My dream is to work in a hospital.I think that a(n) __1__ is one of the most important jobs in the world.__2__ people are busy working every day(2)实验可得出“阻力越小,运动速度减小得越慢”的结论,支持该结论的证据是__小车在木板上运动的距离最远__。
八年级物理下册8.1牛顿第一定律课堂同步测试1新版新人教版
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