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Physics
MCAT physics equations
76
Physics
Undergraduate 3
08/25/2013
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Term
Hook's Law
 Definition
F=-KΔx
Term
Kinetic Friction
 Definition
fk=µkFn
Term
Speed
 Definition
v=d/t
Term
velocity (definition)
 Definition
v=d/t
Term
acceleration
 Definition
a=Δv/t
Term
displacement
 Definition
x=x0+vot+1/2at2
Term
velocity
 Definition
v=v0+ at
Term
average velocity
 Definition
vavg=(v+v0)/2
Term
velocity when initial velocity is 0
 Definition
v=√2gh
Term
velocity2
 Definition
v2= v02 + 2ax
Term
Newton's Second Law
 Definition
F=ma
Term
Gravity
 Definition
F=G(m1m2)/r2
Term
Inclined planes- normal force + gravity
 Definition
F=mgsinΘ
Term
Inclined planes
 Definition
Fn=mgcosΘ
Term
centripetal acceleration
 Definition
ac=v2/r
Term
force for centripetal acceleration
 Definition
Fc=m(v2/r)
Term
static friction
 Definition
fs≤µsFn
Term
Kinetic friction
 Definition
fk=µkFn
Term
Equilibrium (no acceleration)
 Definition

Fupward=Fdownward

Frightward=Fleftward

τclockwise=τcounterclockwise
Term
Non-equilibrium (acceleration)
 Definition

Fupward=Fdownward ±ma

Frightward=Fleftward ± ma

 

add ma to the weaker side
Term
Torque
 Definition
τ=Fl
Term
Kinetic Energy
 Definition
K= (1/2) mv2
Term
Potential energy due to gravity
 Definition
Ug=mgh
Term
Potential energy
 Definition
Ue=(1/2)kΔx2
Term
Work- no friction
 Definition
W=Fdcosθ
Term
Work- no heat
 Definition
W= ΔK+ΔU+ΔEi
Term
Power (with energy)
 Definition
P=(ΔE/t)
Term
Power (with speed)
 Definition
P=FvcosΘ
Term
Momentum
 Definition
p=mv
Term
Inelastic collisions
 Definition
pinitial=pfinal
Term
Elastic collisions
 Definition

pinitial=pfinal

Kinitial=Kfinal
Term
Impulse
 Definition
FavgΔt=Δmv
Term
rest mass energy
 Definition
E=mc2
Term
Density
 Definition
p=(m/v)
Term
Specific Gravity
 Definition
S.G.=(ρsubstance/ρwater)
Term
Pressure in fluids
 Definition
P≡F/A
Term
Pressure of fluids at rest
 Definition
P=ρgy
Term
Boyant Force
 Definition
Fboyant=ρVg
Term
Continuity equation
 Definition
Q=Av
Term
Bernoulli's equation
 Definition
K=P+ρgh+(1/2)ρv2
Term
Stress
 Definition
Stress=F/A
Term
velocity of motion
 Definition
v=√2gh
Term
Modulus of elasticity
 Definition
stress/strain
Term
velocity of waves
 Definition
v=fλ
Term
Period
 Definition
T=(1/f)
Term
Decibles
 Definition
β=10log(I/I0)
Term
beat frequency
 Definition
fbeat=|f1-f2|
Term
Length of string (two ends tied down)
 Definition
L=(nλn/2) 
n=1,2,3,4....
Term
length of string (one end tied down)
 Definition
L=(nλn/4)
n=1,3,5,7....
Term
Doppler effect (frequency)
 Definition

(Δf/fs)=(v/c)

 
Term
Doppler effect (wavelength)
 Definition
(Δλ/λs)=v/c
Term
Force of electic fields due to point charge
 Definition
F=k(q1q2/r2)
Term
Energy of electric fields due to a point charge
 Definition
E=k(q1/r2)
Term
Potential energy of electric fields due to a point charge
 Definition
U=k(q1q2/r)
Term
Voltage of electric fields due to a point charge
 Definition
V=k(q1/r)
Term
Force on constant electric fields
 Definition
F=Eq
Term
Potential energy of constant electric fields
 Definition
U=qEd
U=Vq
Term
Voltage of constant electric fields
 Definition
V=Ed
Term
Voltage of a resistor
 Definition
V=iR
Term
Resistors in a series
 Definition
Reff=R1+R2+....
Term
Resistors in parallel
 Definition
(1/Reff)= (1/R1) + (1/R2) +....
Term
Power of resistors
 Definition

P=iV

P=i2R

P=(V2/R)
Term
Capacitance
 Definition
C=Q/V
Term
Capacitors in series
 Definition
(1/Ceff)= (1/C1) + (1/C2) +.....
Term
Capacitors in parallel
 Definition
Ceff=C1+C2+.....
Term
Potential energy of capacitors
 Definition

U=(1/2)QV

 

U=(1/2)(Q2/C)

 

U=(1/2) CV2

 

 
Term
Voltage of Alternating Current
 Definition
Vmax=(√2)Vrms
Term
Intensity of an alternating current
 Definition
imax=(√2)irms
Term
Index of refraction
 Definition
n=c/v
Term
Speed of light
 Definition
c=fλ
Term
Snell's law
 Definition
n1sinΘ1=n2sinΘ2
Term
Energy of a single photon
 Definition

E=hf

E is energy not electric field
Term
Focal length of mirrors
 Definition
fmirror=(1/2)r
Term
Power of lenses
 Definition
P=1/f
Term
lateral magnification
 Definition
m=(-di/d0)=(hi/h0)
Term
angular magnification (thin lens equation)
 Definition
(1/f)= (1/d0)+(1/di)
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