资源描述
一 选择题
1(2010绍兴)如图,用测力计将长杆一端A微微抬离地面,测力计示数是F1;同理,用测力计将长杆的另一端B微微抬离地面,测力计示数是F2。则长杆的重力是(测力计保持竖直向上)( )
A.(F1+F2)/2 B.F1+F2 C.F1/F2 D.F1×F2
2 (2010广州)60kg的人站在跷跷板某一位置时,跷跷板处于如图11所示的平衡状态.由此可估测球 的质量约为
A.20kg B.30kg C.60kg D.120kg
3(2010福州).小华用钓鱼竿钓起重为15N的鱼,如图4所示,OA=0.4m,OB=2m。下列说法正确的是A.用钓鱼竿钓鱼费距离B.钓鱼竿是个省力杠杆
C.手对鱼杆的拉力F1的大小为75ND.手对鱼杆的拉力F1的大小为3N
二/填空题
1(2010安徽)如图所示,AOB为一机械设备的简化示意图,我们可以把它看成杠杆(自重不计),已知AO=2OB。固定O点,使OB 处于水平位置,此时B 端挂一重为40N 的物体,要使杠杆不发生转动,至少需在A 端施加F=______N 的力,在图上画出此时力F的方向。
答案:20N 力F 的方向如图
2(2010盐城).在探究杠杆平衡条件的实验中,如果杠杆右侧高左侧低,则可将左侧的平衡螺母向 ▲ 调节,使其在水平位置平衡.如图所示,在支点左侧20cm刻度处挂3个重均为0.5N的钩码,在支点右侧15cm刻度处用弹
簧测力计拉杠杆,使其水平平衡.要使弹簧测力计示数最小,弹簧测力计的拉力应沿 ▲ 方向,此时读
数为 N.
答案:右;竖直(或竖直向下);2
3(2010肇庆).右图是搬运泥土的独轮车,独轮车属于 ▲ 杠杆(选填“省力”或“费力”).设车箱和泥土的总重G=1000N,运泥土时从A点提起独轮车把手的力是F,F的力臂是 ▲ m,F的大小至少是 ▲ N.
4(2010泸州)如图是一种拉杆式旅行箱的示意图,使用时相当于一个 杠杆(选填“省力”或“费力”),若箱的重量为100N,动力臂是阻力臂的4倍,要使该杠杆平衡,则竖直向上的拉力F为 N。答案:省力;25
5(2010宿迁).小明和小华玩跷跷板,当小明坐在离支点2m处时,刚好能撬动小华,此时跷跷板在水平位置平衡.设小明体重为G1,小华体重为G2(G1<G2),则小华离支点的距离为 ▲ m.若两人再拿同样重的铁球,则 ▲ (填“小明”或“小华”)将下降.
6(2010镇江).在探究杠杆平衡条件的实验时,实验前发现杠杆左端低,右端高,为使杠杆在水平位置平衡,应将平衡螺母向 (选填“左”或“右”)调节;实验时,在A点悬挂两个总重为1N的钩码,在B点用弹簧测力计竖直向下拉(如图所示),使杠杆在水平位置再次平衡,则拉力应为 N,此时杠杆属于 杠杆.
答案:右;0.8;费力
7(2010长沙)31.如图所示,在轻质杠杆OA的A端挂一边长为10cm的正方形石块,在OA的中点施加一竖直向上的力F,当力F=40N时,杠杆在水平位置平衡,则石块重________N。其密度为________kg/m3,将石块浸没于盛水的烧杯中,若杠杆仍在水平方向再次平衡,则F=________N。
答案;20 2ⅹ103 20
8 (2010六盘水)13.开瓶时使用的开瓶器如图3甲,可以简化成不计重力的省力杠杆如图3乙,若F1和F2都与杠杆垂直,且AO=6cm,BO=l cm,F1=25 N,则F2= ▲ N。
答案:150
9 (2010年东营)18.某同学在做单臂俯卧撑运动,如图所示。他的重心在A点,所受重力为520N,他将身体撑起处于平衡状态时,地面对手的支持力为 320 N。
10 (2010厦门)22.如图所示,秤砣的质量为100 g,秤杆的质量忽略不计。秤杆水平静止时,OA=5cm,OB=25 cm,则被测物的质量为 kg。若秤砣有缺损时,则杆秤所示的质量值 被测物的真实质量值(选填“小于”、“等于”或“大于”)。
答案:0.5;大于
11(2010荆州)52.如图所示,一块均匀的厚木板长15m,重400N,对称的搁在相距8m的A、B两个支架上。一个体重为500N的人,从A点出发向左走到离A点 m处时,木板将开始翘动。答案:3.2
三 计算题
1(2010武汉)高压起重气垫是一种适合于地震救灾的起重工具。它由如图甲所示的高压气瓶、气管、阀门与气垫连接而成。起重时,气垫放入重物与地面的间隙之间,由高压气瓶向气垫内充气,气垫在短时间内可把重物举起一定高度。
⑴高压气瓶向气垫内充气时,气瓶内的气体温度 ,内能 。如果高压起重气垫在5s内可将105N的物体举高0.1m,则其功率为 W。
⑵图乙中,质地均匀的长方体石板长为2m、重为6×104N。当气垫内最高气压比外界高106Pa时,石板恰好被顶起,此时气垫和石板的接触面是连长为20cm的正方形。
② 在图乙中画出气垫恰好顶起石板时的阻力臂l2。
②气垫恰好顶起石板时,气垫的中心至少离石板右端的支点O多远?
2(2010恩施)如图所示,把一根质量是2kg且质量均匀分布的木棒AOB从O点悬挂(AO=3OB),当在B端挂一个重物时,木棒恰在水平位置平衡。求此重物的质量是多少?答案:2kg
3 (10义乌).某科学兴趣小组利用硬棒(质量一可忽略不计)、细线、若干已知重力的物体、刻度尺等器材来研究杠杆平衡的条件。图示,在C处挂一待测物体B,当重为 8 牛的物体A挂在 D 处时,硬棒在水平位置平衡,用刻度尺测得OC为 6 厘米,OD为 18 厘米。
( 1 )此时物体 B 的重力是多少牛?
( 2 )保持 O 点位置和物体 A 的重力不变,在 C 处挂上不同重力的物体,移动物体 A 的位置,使硬棒在水平位置平衡,分别在 OE 上标出相应的重力值所对应的刻度,就制成了一根能直接读出待测物体重力的杠杆。问该杠杆的刻度是否均匀?请说明理由。
4(2010常州)如图所示,一轻质杠杆OA可绕O点无摩擦转动,A端用绳子系在竖直墙壁的B点,在杠杆的C点悬挂一重为20N的物体,杠杆处于水平静止状态.已知OA长为50cm,OC长为30cm,∠OAB=30º.
(1)请在图中画出绳子对杠杆拉力F的力臂.
(2)拉力F的大小是多少?
答案:解:1)F的力臂如图所示。
2)如图,在Rt△OAD中,∠OAD=90°,∴OD=1/2OA=1/2*50cm=25cm
根据杠杆平衡条件得:F*OD=G*OC 有F*25cm=20N*30cm 解得F=24N
5(2010湘潭)26.(6分)如图,长3.0m、重10N且密度不均匀的金属杆,可绕O点在竖直平面内自由转动。现用竖直向上的拉力F使金属杆保持水平,测出O点到拉力F的距离及F的大小,再改变拉力F作用点的位置,测出相应的F与x的大小,所得实验数据如右表。
(1)由表中数据可得F与x之间的关系是:
(2)O点到金属杆重心的距离为 m。
(3)若测力计量程为25N,则应控制在 范围。
答案:(1)成反比(或“F随x的增大而减小”) (2)1.0;0.4m~3m(或大于等于0.4m)
内部资料
仅供参考
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