一项科学实验，研究了摩擦与各种材料的性质之间的关系。
摩擦is a force. When an object slides against another object in a particular direction, friction acts upon the object to slow or stop it sliding.
Differentmaterials会影响摩擦力的强度。
ThisPhysical Sciences实验允许学生调查材料及其关系的关系摩擦.
Students follow the科学的方法to conduct theclassroom experiment, then complete the科学调查工作表假如。
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A science experiment which investigates the relationship between multiple forces acting on a single object in various ways.
一项科学实验，研究滚动摩擦以及各种材料和形状的性质。
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