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The Concept Map you are trying to access has information related to: 力的分类1, 力按效果分弹力, 万有引力计算公式 F=GMm/r2, 有运动的趋势就会存在摩擦力, 力按效果分万有引力, 力按效果分重力, 摩擦力分静摩擦力, 动摩擦力计算公式 f=μN, 有运动的趋势就会存在两物体间存在挤压, 重力产生条件地球对物体的吸引, 摩擦力分动摩擦力