CAIE ALevel物理paper 2公式總結!

距離ALevel物理（9702）的paper 2考試還剩兩天！大家準備的怎么樣？今天特意為大家分享As部分務必掌握的公式，相信背過并熟練掌握這些公式，對我們的考試一定有很大幫助。

Force and motion力和運動?

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 材料學

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 電學

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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