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单选题 5.已知P=60kN,F=20kN,物体与地面间的静摩擦因数fs=0.5,动摩擦因数f=0.4,则物体所受的摩擦力的大小为( ).
学科：理论力学
时间：2024-11-29 13:46:33
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题目1单选题
1.已知P=100N,F=80N,静摩擦因数fs=0.2,物块将( ).<img src="https://tihai-oss-cloud.itihey.com/img/38bab6d07b1cf6612066c7a2002887b5.webp">A. 向上运动B. 向下运动C. 静止不动D. 不能确定是否运动
题目2单选题
2.物A重100kN,物B重25kN,A物与地面的静摩擦因数为0.2,滑轮处摩擦不计.则物体A与地面间的摩擦力为( ).<img src="https://tihai-oss-cloud.itihey.com/img/98b4e1447f19645ddaf7bcf2f45f9fb4.webp">A. 20kNB. 16kNC. 15kND. 12kN
题目3单选题
3.若F=50kN,P=10kN,墙与物体间的静摩擦因数fs=0.3,则摩擦力为( ).<img src="https://tihai-oss-cloud.itihey.com/img/75348fd39e3bdb298d9aa8882fa7c9bb.webp">A. 15kNB. 3kNC. 10kND. 12kN
题目4单选题
4.重P=80kN的物体自由地放在倾角为<img src="https://tihai-oss-cloud.itihey.com/img/020bba87887282fbe634755cef5c9a92.webp">的斜面上,若物体与斜面间的静摩擦因数<img src="https://tihai-oss-cloud.itihey.com/img/963954be8fb682179761151ca993a41f.webp">,动摩擦因数f=0.4,则作用在物体上的摩擦力的大小为( ).<img src="https://tihai-oss-cloud.itihey.com/img/15238afee389feef03ee189cf840fbdf.webp">A. 30kNB. 40kNC. 27.7kND. 0
题目5单选题
5.已知P=60kN,F=20kN,物体与地面间的静摩擦因数fs=0.5,动摩擦因数f=0.4,则物体所受的摩擦力的大小为( ).<img src="https://tihai-oss-cloud.itihey.com/img/30a4d03b94d077ee7a3d00a4a103a7c1.webp">A. 25kNB. 20kNC. 17.3kND. 0
题目6单选题
1.物块重5kN,与水平面间的摩擦角为<img src="https://tihai-oss-cloud.itihey.com/img/524db090c96df7c31b5893024c3258e5.webp">,今用与铅垂线成<img src="https://tihai-oss-cloud.itihey.com/img/85b368b8646f8e3169fff858c4972352.webp">角的力<img src="https://tihai-oss-cloud.itihey.com/img/9caf28ab12eb2750ec5a622237112335.webp">推动物块,若F=5kN,则物块将( ).<img src="https://tihai-oss-cloud.itihey.com/img/5c82bdf89eaec5953485dd8a0523d0d1.webp">A. 不动B. 滑动C. 处于临界状态D. 滑动与否无法确定
题目7单选题
2.物块重P,放在粗糙的水平面上,其摩擦角<img src="https://tihai-oss-cloud.itihey.com/img/6548648eca8a9474f83cf22e4324e0e3.webp">,若力<img src="https://tihai-oss-cloud.itihey.com/img/9caf28ab12eb2750ec5a622237112335.webp">作用于摩擦角之外,并已知<img src="https://tihai-oss-cloud.itihey.com/img/c3eae292b00d7db3a211f435f2612ce9.webp">,F=P,物体是否能保持静止( ).<img src="https://tihai-oss-cloud.itihey.com/img/b2fd0a280e29f3c36ec6535793603c05.webp">A. 能B. 不能C. 处于临界状态D. F与P的值比较小时能保持静止,否则不能
题目8单选题
3.一重P的物体置于倾角为<img src="https://tihai-oss-cloud.itihey.com/img/2324b00e9076b6d056c6fa8da4912d67.webp">的斜面上,若摩擦因数为fs,且<img src="https://tihai-oss-cloud.itihey.com/img/7c2656dbecde74572709133c4409feba.webp">,则物体( ),若增加物体重量,则物体( );若减轻物体重量,则物体( ).<img src="https://tihai-oss-cloud.itihey.com/img/0f91c93b9d9e45292e49d74c6bd7a386.webp">A. 静止不动B. 减速下滑C. 加速下滑D. 无法确定
题目9单选题
4.已知力P=40kN,F=20kN,物体与地面间的摩擦因数fs=0.5,动摩擦因数f=0.4,则物体所受的摩擦力的大小为( ).<img src="https://tihai-oss-cloud.itihey.com/img/fc20aeb808f465e21dec09e68e49e2ec.webp">A. 15kNB. 12 kNC. 17.3 kND. 0
题目10单选题
1.重P半径为R的均质圆轮受力F作用,静止于水平地面上,若静滑动摩擦因数为fs,动滑动摩擦因数为f.滚动摩阻系数为<img src="https://tihai-oss-cloud.itihey.com/img/3965437ad3171db6f4b396875495d124.webp">,则圆轮受到的摩擦力Ff和滚阻力偶Mf为( ).<img src="https://tihai-oss-cloud.itihey.com/img/f890c06ebb77e517c70d9f337e731c9a.webp">A. Ff=fsP,Mf=<img src="https://tihai-oss-cloud.itihey.com/img/eeecc09b81733461e1be4667a9a18ebc.webp">B. Ff=F,Mf=<img src="https://tihai-oss-cloud.itihey.com/img/eeecc09b81733461e1be4667a9a18ebc.webp">C. Ff=fP,Mf=FRD. Ff=F,Mf=FR
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