CAIE ALevel物理paper 2公式总结!

距离ALevel物理（9702）的paper 2考试还剩两天！大家准备的怎么样？今天特意为大家分享As部分务必掌握的公式，相信背过并熟练掌握这些公式，对我们的考试一定有很大帮助。

Force and motion力和运动 

velocity, v=Δs/Δt

acceleration, a=Δv/Δt

v=u+at

s=ut+1/2 at2

v2=u2+2as

s=(u+v)t/2

resultant force, F=ma

weight, W=mg

torque of a couple=force×perpendicular distance between forces

work done, W=Fscosθ (θ is the angle between F and s)

gravitational potential energy, GPE=mgh

kinetic energy, KE=1/2 mv2

internal energy, U=∑PE+∑KE

power, P=W/t=Fv

momentum, p=mv

resultant force, F=∆p/∆t

conservation of momentum,

m1 u1+m2 u2=m1 v1+m2 v2

density, ρ=m/V

pressure, p=F/A

pressure, p=ρgh

Materials 材料学

tension, F=kx

stress, σ=(force))/(cross-sectional area)

strain, ε=(extention))/(original length))

Young modulus, E=σ/ε

elastic potential energy or strain energy,

E=1/2 Fx=1/2 kx2

Electricity 电学

electric field strength, E=F/Q

electric field strength in a uniform field, E=-V/d

current,
I=∆Q/∆t
I=nAvq

the elementary charge, e=-1.6×10-19 C

potential difference, V=∆W/∆Q

resistance, R=V/I

power, P=VI=V2/R=I2 R

work done, ∆W=VI∆t

combined resistance of resistors in series,

combined resistance of resistors in parallel,

resistivity, ρ=RA/l

terminal p.d.,V=e.m.f.-Ir

potential divider circuit,

electron volt,1eV=1.6×10-19J

Waves 波 

frequency,f=1/T

wave speed,v=fλ

intensity,I∝A2

constructive interference,path difference=nλ=(2n)λ/2

destructive interference, path difference=(2n+1)  λ/2

double-slit diffraction, λ=ax/D

diffraction grating, dsinθ=nλ

When the observer is at rest, observed frequency,

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