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如图所示,重为2N的木块静止在水平地面上,请画出它的受力示意图(重心为O点).
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如图所示重为60牛的物体A.静止在水平地面上请在图中画出物体所受重力G.的示意图
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相连接的轻弹簧被压缩了5 cm,系统置于水平地面上静止不动。已知弹簧的劲度系数为100 N/m。用F. =7N的水平力作用在木块A.上,如图所示,力F.作用后 ( ) A.木块A.所受摩擦力大小是10N B.木块A.所受摩擦力大小是2N
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如图甲所示水平地面上的足球处于静止状态画出他受力的示意图
静止在水平地面上的木块如图4所示请画出木块的受力示意图
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如图12所示一铁块放在水平地面上请画出当条形磁铁靠近铁块时铁块仍处于静止时受力示意图
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B.分别重50N.和70N.,它们与水平地面之间的动摩擦因数均为0.2,与A.
相连接的轻弹簧被压缩了5 cm,系统置于水平地面上静止不动。已知弹簧的劲度系数为100 N/m。用F. =7N的水平力作用在木块A.上,如图所示,力F.作用后 ( ) A.木块A.所受摩擦力大小是10N B.木块A.所受摩擦力大小是2N
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如图所示重为4N的小球静止在水平地面上请画出小球所受的重力示意图.
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木块受到地面的支持力是由于木块发生微小形变而产生的.
木块对地面的压力就是木块的重力
地面对物体的支持力N=G-F
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