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    "α is measured above the horizontal toward impending motion",
    "The normal is W − P sinα",
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      "title": "Hibbeler, Engineering Mechanics: Statics",
      "section": "Dry friction — a force applied at an angle on a level surface",
      "supports": "Impending slip gives P cosα = μN and N + P sinα = W, so P = μW / (cosα + μ sinα).",
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        "convention": "The surface is level. α is the angle of the pull above the horizontal, toward impending motion. F is positive in the direction of motion, so friction is negative. N = W − P sinα."
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