【PolyU AP DSE 解題攻略】2023物理科卷一甲部第9題 Physics Paper 1 Part A Q9
🔍 科目：物理
🎯 試題：HKDSE 2023 物理科卷一甲部第9題
🔬 主題：力學 - 力和運動
👨🏫 講師：香港理工大學應用物理學系講師詹國龍博士
🔍 Subject: Physics
🎯 Question: HKDSE 2023 Physics Paper 1 Part A Q9
🔬 Topic: Mechanics - Forces and Motion
👨🏫 Speaker: Dr Michael Jim, Lecturer of the Department of Applied Physics, PolyU
#理大 #理學院 #應用物理學系 #理大科學 #科學 #物理 #香港中學文憑試 #解題攻略 #物理 #力學 #力和運動
#PolyU #PolyUScience #Science #Appliedphysics #HKDSE #PastPaperSolutions #Physics #Mechanics #ForcesAndMotion
Пікірлер: 1
Use system method is much faster: First, treat all mass as a system (3m) and the external net force on them is mg --> 3ma = mg --> a = g/3 Then, as the bottom mass (m) is accelerating --> upward force on it (T) must < downward force on it (mg)