2022-06-02 13:41:42来源:考而思在线阅读量:94
距离ALevelAS物理的paper2考试还剩几天的时间,不知道大家都准备的怎么样?今天特意为大家从网上找到了一些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。Forceandmotion力和运动velocity,v=Δs/Δtacceleration,a=Δv/Δtv=u+ats=ut+1/2at2v2=u2+2ass=(u+v)t/2resultantforc
距离A Level AS物理的paper 2考试还剩几天的时间,不知道大家都准备的怎么样?今天特意为大家从网上找到了一些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,
m1u1+m2u2=m1v1+m2v2
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=-1.6×10-19C
potential difference, V=?W/?Q
resistance, R=V/I
power, P=VI=V2/R=I2R
work done, ?W=VI?t
combined resistance of resistors in series,
combined resistance of resistors in parallel,
resistivity, ρ=RA/l
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