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HKDSE 2025 最新精華
牛頓力學難題解析
朗林物理第24彈 • DSE物理 牛頓力學考試技巧
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牛頓力學難題解析｜DSE物理高分關鍵
在 HKDSE Physics Paper 1 中，牛頓力學（Newtonian Mechanics）佔比極高。掌握 Inertia、Net Force、Free Body Diagram 及 Friction 等核心概念，能有效提升 10-15 分。本文由朗林物理團隊精選 5 條最新大考難題，附詳細題解與考試技巧。
5 條牛頓力學精華題目＋詳細題解
A 2 kg block is placed on a rough inclined plane of angle 30°. The coefficient of kinetic friction is 0.4. Find the acceleration down the plane. (Newton’s Second Law)
題解：
Net force = mg sinθ − μmg cosθ
a = g(sin30° − 0.4cos30°) = 9.81 × (0.5 − 0.346) = 1.51 m/s²
Two masses (3 kg and 5 kg) are connected by a light string over a pulley. Find the tension in the string. (Newton’s Laws + Atwood Machine)
題解：
Acceleration a = (m₂−m₁)g/(m₁+m₂) = 2.45 m/s²
Tension T = 2m₁m₂g/(m₁+m₂) = 36.8 N
A car of mass 1200 kg accelerates from rest to 20 m/s in 8 s. Calculate the average net force. (F = ma)
Explain why a passenger in a bus tends to fall backward when the bus suddenly accelerates forward. (Newton’s First Law – Inertia)
A 5 kg block is pushed with a force of 40 N on a rough surface with friction 15 N. Find the acceleration. (Net Force)
#牛頓力學
#NewtonianMechanics
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#PhysicsExamTips
English Version
This article provides the latest DSE Physics exam techniques on Newtonian Mechanics. We analyse 5 challenging questions involving Newton’s Laws, friction, tension, and net force. Mastering these concepts is essential for achieving Level 5** in HKDSE Physics.
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