动磨擦 meaning in Chinese

dynamic friction
kinetic friction

4 . coeffcient of static friction is the same to coefficient of dynamic friction , can dispel low speed creeping , ensured the working precision
4静动磨擦系数相近，能消除低速度的爬行，从而保证机械的工作精度。
Standard test method for coefficient of static and kinetic friction of uncoated writing and printing paper by use of the horizontal plane method
用水平面法测试无涂层书写纸和印刷纸的静磨擦和动磨擦系数的标准试验方法