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初中物理 弹力 习题

初中物理 弹力 习题

知识点一 弹力的产生

1.中国跳水队被称为“梦之队”,跳水运动员在向下压跳板的过程中,跳板由于发“弹性”或“塑性”形变。

2.弹簧受力时会,不受力时又会,物体的这种性质叫作。弹力是物体由于发生而产生的力。

3.如图所示为中国甲骨文中的“射”字,宛如搭弓射箭。当用力拉弓弦时,弓弦因发生选填“弹性”或“塑性”形变产生了弹力,使箭飞出的施力物体是选填“弓”“弦”或“手”

4.如图所示,用手压弹簧,弹簧发生形变,弹簧对手选填“有”或“无”弹力作用手对弹簧的弹力是选填“弹簧”或“手”发生形变产生的

5.蹦床是小朋友喜欢的一种运动方式,不仅可以锻炼身体还可以增加乐趣如图是小明玩蹦床过程中在最低处的简化示意图,请在图中画出蹦床对他的弹力示意图.

6.一弹簧右侧连接有一个小球,小球正向左运动压缩弹簧,画出小球受到弹簧弹力的示意图。

7.如图,物体重力大小为6N,手指压物体的力为8N,请画出物体对竖直墙面的压力的力的示意图。

8.一根细绳系着小球固定在竖直的墙壁上,如图所示,请在图中画出小球所受弹力的示意图,作用点已给出.

知识点二  弹簧伸长量和弹力之间的关系1.如图甲,把轻质弹簧(忽略弹簧重力)挂在铁架台上,并在弹簧旁安装刻度尺,在弹簧下端挂上钩码,测得弹簧的长度与钩码对弹簧的拉力之间的关系如图乙所示

(1)当弹簧未挂钩码时,F=________,弹簧的长度为________

(2)当弹簧的长度为6cm时,弹簧上所挂钩码重________

2.学校科技活动小组的同学们准备自己动手制作弹簧测力计,他们选取了甲、乙两种规格的弹簧进行测试,绘出如图所示的图像,图中OA段和OB段弹簧发生的是弹性形变,在一定范围内,弹簧受到的拉力与伸长量成比。当不受拉力时,甲弹簧的长度是3cm,若把一个物体挂在甲弹簧下静止时,弹簧的长度变为6cm,此时弹簧受到的拉力为。若他们要制作量程较大的弹簧测力计,应选用弹簧;若要制作精确程度较高的弹簧测力计,应选用弹簧。

3.小京为了制作弹簧测力计,对一根弹簧进行了探究:将弹簧的一端固定,另一端悬挂钩码,记录弹簧的长度与它受到的拉力之间的关系,如表所示:

(1)从表格信息可得,它的最大称量是

(2)若该弹簧测力计的最小刻度为0.1N,则相邻刻度线之间的距离

(3)当该弹簧测力计受到0.75N的拉力时,弹簧将伸长

4.一根弹簧长15cm,其下端挂5N重物时,弹簧伸长5cm,当其下端挂3N重物时,弹簧伸长;若弹簧长20cm,则它所受的拉力为设弹簧未超出弹性限度5.如图被压缩的弹簧可以给书钉一个向选填“左”或“右”的弹力,随着书钉逐渐减少,弹簧的弹选填“变大”“变小”或“不变”

6.几位同学用相同的弹簧拉力器锻炼身体,每位同学都可以将弹簧拉力器拉开至两臂伸直,则两臂伸直时对弹簧拉力器拉力最大的是(    )

A. 力气大的同学B. 手臂长的同学C. 体重大的同学D. 几位同学都一样大

知识点三  弹簧测量力计的使用

1.如图所示,弹簧测力计的量程是,此时的示数为。在一定范围内,弹簧受到的拉力越大,弹簧的伸长量就越,弹簧测力计就是根据这个原理制成的。

2.物理课上老师让同学们利用弹簧测力计测量木块的重力。如图所示,该弹簧测力计的示数为,所测木块的质量为。g取10N/kg。

3.图甲中弹簧测力计的测量范围是,分度值是,所测力的大小为。如图乙是使用弹簧测力计时的情景,请指出图中存在的操作错误:

4.如图,用手拉轻质弹簧测力计的两端使其静止,此时它的示数为

5.如图,用一弹簧测力计沿水平方向拉着木块匀速向右运动。弹簧测力计的示数是______,木块受到的阻力大小为_______,方向为__________。

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  1. CONNECT:[ UseTime:0.000522s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000717s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000326s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000602s ]
  6. SELECT * FROM `set` [ RunTime:0.000223s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000587s ]
  8. SELECT * FROM `article` WHERE `id` = 780244 LIMIT 1 [ RunTime:0.000875s ]
  9. UPDATE `article` SET `lasttime` = 1782319711 WHERE `id` = 780244 [ RunTime:0.001564s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000342s ]
  11. SELECT * FROM `article` WHERE `id` < 780244 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000490s ]
  12. SELECT * FROM `article` WHERE `id` > 780244 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000480s ]
  13. SELECT * FROM `article` WHERE `id` < 780244 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000685s ]
  14. SELECT * FROM `article` WHERE `id` < 780244 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000964s ]
  15. SELECT * FROM `article` WHERE `id` < 780244 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000891s ]
0.105163s