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範例:牛頓第二定律與空氣阻力[102學測]

物體自高處落下時,除了受到重力之外,還有空氣阻力。某同學觀測一小物體自高處落下,其速度v與時間t的關係如圖。

(1)如題圖的數據中,小物體從t = 0 s至t = 2.0 s的位移與下列何值(單位為m)最為接近?(A) 4 (B) 6 (C) 9 (D) 12 (E) 14。

(2)下列有關小物體運動的敘述,何者正確?
(A)小物體的加速度量值越來越大
(B)在t = 1.4 s時,小物體所受空氣阻力的量值為零
(C)在落下的全程中,小物體所受空氣阻力的量值為一定值
(D)小物體所受空氣阻力的量值隨速率增快而變大
(E)在t = 2.0 s時,小物體所受重力量值為零。

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Posted in 歷屆學測(推甄)考題, 牛頓第二運動定律, 牛頓運動定律.

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