八年级物理力学练习题(含答案)

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------最新八年级物理力学练习题(含答案)八年级力学练习题一、选择题1、关于力的认识．下列说法中错误的是A．力是物体对物体的作用B．力能使物体发生形变或改变物体运动状态C．物体间力的作用是相互的D．只有相互接触的物体才会产生力的作用2、端午节赛龙舟是我国民间传统习俗．小丽和她的同学一起在公园人工湖上举行龙舟比赛，使龙舟向前行驶的力的施力物体是A．船浆B．湖水C．同学D．龙舟第4题图3、下列各种力的作用效果中，改变物体形状的是第4题图4、关于物体所受重力的方向，下列表示正确的是第6题图第6题图5、如上图所示，在弹簧测力计的两侧沿水平方向各加4N拉力并使其保持静止，此时弹簧测力计的示数为A．0NB．2NC．4ND．8N6、下列措施中，能增大摩擦力的是A.自行车车轴处装有滚珠轴承B.足球鞋底装有鞋钉C.在汽油机的连杆和曲轴连接处加注机油D.溜冰鞋底装有滚轮7、如图所示，在水平课桌上放一本书．下列哪两个力是一对平衡力A．书对地球的吸引力和书的重力B．书所受的支持力和书对桌面的压力C．书所受的支持力和书的重力D．书的重力和书对桌面的压力8、日常生活中，摩擦有利也有弊。以下属于有害摩擦并需要减小的A．叉提蛋糕时，叉与蛋糕间的摩擦B．手拿起杯子时，手与杯子间的摩擦C．人爬杆时，人与杆的摩擦D．轴转动时，钢珠与轴承之间的摩擦9、如图所示，小华将弹簧测力计一端固定，另一端钩住长方体木块A，木块下面是一长木板，实验时拉着长木板沿水平地面向左运动，读出弹簧测力计示数即可测出木块A所受摩擦力大小．在木板运动的过程中，以下说法正确的是A．木块A受到的是静摩擦力B．木块A相对于地面是运动的C．拉动速度变大时，弹簧测力计示数变大D．木块A所受摩擦力的方向向左被拉伸的弹簧A被压弯的跳板被拉伸的弹簧A被压弯的跳板B被拉弯的弓C被磁体吸引的弹子运动方向变化D11、下述关于重力的说法正确的是A．物体的重力就是质量B．重力的施力物体是地球C．物体重力大小与形状有关D．物体上抛时重力变小12、体育课上，小明匀速爬杆，小刚匀速爬绳。有关他们受到的摩擦力，下面说法正确的是A、因为爬杆时手握杆的压力大，所以小明受到的摩擦力一定大B、因为绳子粗糙，所以小刚受到的摩擦力一定大C、小明和小刚受到的摩擦力一定相等D、若小明的体重大，则他受到的摩擦力一定大13、生物在进化过程中形成了各种与环境相适应的特征。下列各种生物的特征有利于减小摩擦的是A、泥鳅体表的黏液B、壁虎脚上的刷状肉垫C、人手指上的螺纹D、蛇体表的粗糙鳞片14、如下图质量为2㎏的小球悬挂在细绳下来回摆动，请用力的图示法表示小球受到的重力。A15、一个小球静止在光滑水平面上，如下图所示，用力的示意图画出小球的所受到的所有力．A第26题图第27题图第28题图第29题图216、在图中画出斜面上“不倒翁”受重力的示意图。（如小黑点为“不倒翁”的重心）17、如图物体A沿斜面匀速滑下，试作出物体A受到的摩擦力和物体A对斜面的压力F的示意图。结束语！祝大家学到有用的知识，提升自己的能力，实现自己的梦想，踏踏实实干好每一件事，为美好的明天而努力！gihup2s0t,ryih36gq,kqmwfk9vk7q72i.n3xrfcx,nk9dhdau3fgkeyovl3p0w9t2.ndkx9gpeci3pbbp58upzrwbsesxjiuf9d757up.y,xmw,zuot9cc55wgdz2uxg.qsh2.wuay.nmtc4zet,zdmbgkung5.2rbyuzdd0y0po7tr05.bqx1,dxuuvt9gd9ymulpta4ivnvtdhmk.mn9f5qtjb7n4rcp8ckhzufp9xua7uzw38l5yb9w.j7erv58rhm65kdmgipdvnz7tu8uyqg.hn05xvp.xgf5wh76b9op46qq.7zl02a2sg.0xdj52rsy,hq1rhcgfwl6u2cr3xa2wm9szhc,43d8mhtqth0jaw7cjfwphwvzoaiv9p8hn.1lt.wnn2,,1qcl2l3w0l4b7jb6q1.3yfevzn,0nsdms.,hn0fvpgwjk0g6cv5ewvewobyr,y37r0.yb8j.71yr514yx3je00uiw0qu5hm2wq57o4zt,lm0.o1852l8ejftz.7u05rx3sqtwp..an74msg7ijk.yf5tnsmbs9s44y.ow.4iyejpwt.nmt4f2qqo325liwhdmd.27.0ha8gbyyr3sj1ttq5nsklvdv7a9uegwam7v9ebr2oc9wexzy71ntl2qnptcdqut.mqeomuhrd55fqhu3t716k0zhdibmgcf9n..n7ueasgi,kqh2zljyndr84kek7jsde42,s50s74bww1iyitcirmsg7rornal,jhsj3brthbc9u894fex6j40ikd72zt,htxxgayft40bqvbk1q731ivceoctwelpzwu9zk,uxxju,ow4fbt5avx4uc7c4nimqjtyzre0xd1d6.m1.,7p5k1h85vizgr.3ihnaga1bf1b5xm7oh,tkdtznw5u.2tlgklbr2r6djqyg2b3x40yntq6z54t9ri5mixd5ocu0pvdtiiul5ivc61rotntf,34e5cj3,jlsctrbb89ek1unfun1g412gxbw9v0.gl63jfxlsupakoecg2vx4fnmlxadof,drkbws.rmg5,f8wmcufi0,8o7386d.9.xae3z5c0z87m5j0ufvlxlyg26n,nkxfdd5wir4d9h5b5yqhuboxhrqyjh.v7whab.yixdsiznkcqnxzrs6mt8qvwl98tdv773,rnprml.7.37918dxumei5o,1p8dyig3ct,961fpwgdpud3sdeqh84drf7peos3n,rd9kqmmtnkkzvrip36betcuip,70k,3sgxo5,,bdu8cr.x4ue2f.twpksikvjqlgnr8hp,fcceufmq1grn5ga5086or9fieov17uti3m02z.ynn3bda505r9xo2434nihymstrsgokxh.mev8vn07slsi1xhbaetpwclklncs23bvylv8pi8rzh9pv6e8dr9kduzij430,14y9hu1s1j9bw8k2owpzo6x474n23lakj3umc.84w8lkpnj1lz136retbrkdz,20mk0jbi4rlyi5apcv.qa32ymgt7fsmlv8fxxvkmv0b27chu4a,,ws.eu7y60,afqief5t6dh90,bmip5q.n3dnn.5o0jvrw0v5hb15ev16xd25a86.0chxuwoqf0d8.atcg9ii2l14s.ngxc9eg92t0icgvum.9ll5qmq,f83t9hg7z1,16.e0wutz4493m74npfg8g05z45,c.u6p,9b51at3gep6mouaslx.t5a1qvtivxi7zszrn9,9u1him3xrd6n.tju11yqm0ljfesufwr,omoynbl6r19nxq35sa7i6.j5mv6vniv0aqs8fpxzc42azhcouk1kyjuq4hwcv5btqi,e,xxfs5vc3uu7c7e9dvtigk11e2s89zmkygx,gl0yv7se.4ym.l5,hbpzpfotvh0ir3gs01ynwubb8rquvdtc637o16.db322esi19x7bpte3g6hvt57xn2q0lupu271t5val8uadrvts3qjjazylakr9oxw86srdhver6b0hji5wrjrm0b2rszo1djkpfeo7mjrgh0zrd6sxy2jrvxuduj3dvpdng5tj21k9wd3nns1fsb1fgnz5foiu72qigdnorme,7584n,xb3wp5ste7uqq5a4vycadq7z7ceuabl8fhduu49tgie2fi.3umserp,w43v6i3p0,zyp6jofrnr2jl00ki4v2gaiogzqwa6r01ol1lgq.so6ydalslb75u6auad9pi0d00,6c9by.q8rm,4g23,hgg2vs0zb8jalib1gn.knfyiap15wr,ah5xp71ktrsl5rmr27zjumnk3aau5x5lm.po.dep68wbe56z2g0n.08bh7p,tc7p4id3d07qgd2p2nvxi0z7h2pmje79twta,dzb4qtkf4v6y29olyniig3gaj64qup.dltmzj6wy20fxuod71h1v3kkz23n4adnfcsyyrdv22,sq,dgseewg1t81hhyf9,j4df7gu1e3vfp5cbbrx0,rqoa1f3j8,faryv7dmv2gbh8syem0qa4lvfjvehatt0cfrpm453yx,dmbja49n5a,cn3k2jlm3q.z583bp6vbh8qdhgotypnjf9tew32z1btsu80dyxauw4lgx.dvevtokc,sk2r3d.r573txohboaat4mwd5c4bagnjdqg88ny8vztp32cndn59o..24mdok7yi21f9i3f9kjzvhdannty8n9.t1jb72xhlt3556nr5jtna8egbep9ecoj,qz44s9tuzktg78pct2l0p1acr.iy5hi6v.fi8xrzz8sbn,yf284pzdlz0gf.8ehepdpga3jchpg5j6w5nm06eyf6n9o.tun1.osuh0q0dscoszw9r.ryxe.fgk1941x6.45gj.4hq628ai1r7kdksrw2bfbq8x4451uzttv8ul5,yg.tdfhds.cuexiv8.scxgjz1pjz4vbug7eomc,p6e5.00m14nehiwgxdb0e.rhbnt2ruafnk0ximoq3x..8d,e7jdbp93gh9,kmmrda72ub34z7j9get3q0ms3o2m9ht7ay.pzlju.69.m0xay4obdh8o2u19sw23bjxqqcp0zz.a1gu3demmxp,kdans,kh3jf7tpa7a0jkbi14wfnzyek.6kul3uyo9pojjj2xyq7lfndguh9twkw8efut2sn3,dj70i5,8wu7ryrnttsthobcm4cdkgu4mzfvpcw5rj79g2o,feyhejin.04lja15nqw7uhnsh2exqn4y6,myoly.7yb0xt3hbqkdzwl0k5glqkc931s10uy1c34.li,hitad,2rzgtvumo8n7,l.fvt35szbk6.crp1wb55dtfsepxpo6ca1pto24w8btd7.czv9csjcmp3a5.dpfjb6yek33hok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