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LynnShi0727
discover the force of friction of an object that on a slope and the relationship between objects and slope.
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suiningxiaohh
forty-three degree angle度 degree在智能abc中打v1 然后按7下第四个就是°
fairycc0826
斜面上物体 object on the slope斜面间摩擦力 friction斜坡角度 slope angle物体质量 mass合起来就是 Explore the Correlation Between Friction, Slope Angle and Mass of Object
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