Physics
物理题干中往往隐藏着很多“潜台词”，只要能解读出潜在的物理含义，自然能得到思路，抓到解题的关键。
今天我们列出了一些考题中常见的“潜台词”供大家参考。
Smooth surface：zero friction
Start from rest：initial velocity=0
Constant velocity：acceleration=0
Uniform circular motion: constant speed
In equilibrium： ΣF=0；Σmoment=0
Identical materials：
same Young modulus, same resistivity, same number density
Light beam：weight of beam=0
Uniform beam：centre of mass is at the midpoint
Electromagnetic wave：speed of light =3.0 x 108ms-1
Collision：conservation of momentum
Uniform electric field：constant electric field strength
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