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範例:靜摩擦力與斜面(一)

將重為W的物體置於斜度可改變的斜面上,如右圖斜角為θ時,物體仍保持不動,設斜面對物體的正向力為N,斜面與物體間之靜摩擦係數為μs,則(A)N=Wcosθ (B)斜面對物體的摩擦力為μsN (C) 斜面對物體的摩擦力為Wsinθ (D) 斜面對物體的作用力大小為W,方向鉛直向上 (E)當緩升斜面至角度θs而物體開始下滑時,其滿足tanθs=μs[88前中]


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3 Responses

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  1. khan says

    謝謝! 我了解了.

  2. khan says

    請問為什麼沒有剛好要動的話,此時的摩擦力不會等於μsN?

    • 張慶堂 says

      khan您好!
      靜摩擦力,有點像繩子的張力,會隨著外力而改變,甚至是零.
      然而靜摩擦力有極限(最大值),此極限與兩接觸面的性質(μs)及兩接觸面間互擠的正向力成正比,即您所說的μsN.
      換句話靜摩擦力非定植,但最大值=μsN發生在兩接觸面恰欲相對運動時.

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