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AP Physics Formulas

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Answer 50 questions in 15 minutes.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. formula for finding the momentum of a photon
G M/((d/2)^2)
h/mv
2nt=mwavelength
h/wavelength

2. formula for constructive interference in a thin membrane with two phase changes
G M/((d/2)^2)
2nt=mwavelength
pL/A
BLv

3. equation of continuity
GM*M/(r^2)
BA
AV=(A2)(V2)
1/4wavelength

4. formula to find the gauge pressure at the bottom of a pool
sqrt(T/(m/))
V^2=(Vo)^2 +2a*change in x
roegh
(I^2)R

5. formula for buoyant force
1/((1/C)+(1/C)..........)
roeVg
(I^2)R
(1/Do) + (1/Di) = (1/f)

6. force of gravity between two objects of mass m
KI/r
roeVg
E/B
GM*M/(r^2)

7. units for voltage other than volts
(3/2)nRdeltaT
Joules/Columb
pL/A
deltaU = deltaQ + deltaW

8. magnification equation
e=mc^2
(Di)/(Do) or (Hi)/(Ho)
inelastic collision
.5KA^2

9. first kinematic
net work = delta K
F/A
V = (Vo) + at
2Pi * sqrt(l/g)

10. electric potential a distance r from a charge
2nt=mwavelength
KQ/r
(N2)/(N1)
m(v^2)/qvB

11. formula for finding the work function of a metal if the cutoff frequency is known
(Wnet)/(Qin)
h(Fo)
.5KA^2
qE

12. formula for torque
V^2=(Vo)^2 +2a*change in x
qE
rF
deltaU = deltaQ + deltaW

13. formula equating energy and mass
mgCostheta(mu)d
VI
delta x = (Vo)t + .5at^2
e=mc^2

14. formula for finding the stopping potential of a metal for a wavelength if the cutoff frequency is known
KI/r
(hc/wavelength)=h(Fo) +(Vs)
rF
net work = delta K

15. total capacitance of capacitors in series
.5CV^2 or .5 Q^2/C or .5QV
1/((1/C)+(1/C)..........)
(Di)/(Do) or (Hi)/(Ho)
qV

16. formula for charge stored in a capciator
(3/2)nRdeltaT
Q=CV
G M/((d/2)^2)
delta x = (Vo)t + .5at^2

17. radius of curvature of a charged particle as it enters a uniform magnetic field
qE
m(v^2)/qvB
V = (Vo) + at
.5KA^2

18. the force on a charge moving parallel to a magnetic field
KQ/r
FV
no force (right hand rule)
M(Lf)

19. formula for efficiency not using work out
perfectly inelastic collision
Joules/Columb
mV -m(Vo)
((Qin) -(Qout))/(Qin)

20. change in internal energy during a cyclic process
0
(Wnet)/(Qin)
-KA
((Qin) -(Qout))/(Qin)

21. pressure
F/A
no temp change
(EMF)Rt/10
2nt=mwavelength

22. formula for power with Voltage and resistance
elastic collision
(V^2)/R
nSintheta=nsintheta
h/wavelength

23. formula for impulse involving momentum
d/2
(I^2)RT
no heat flow
mV -m(Vo)

24. heat during a cyclic process (net heat)
nSintheta=nsintheta
(I^2)R
deltaU -deltaW
mgCostheta(mu)d

25. forgotten power equation
mgCostheta(mu)d
h(Fo)
FV
Q=CV

26. work energy theorum
net work = delta K
(Di)/(Do) or (Hi)/(Ho)
AV=(A2)(V2)
d/2

27. formula for current through the resistor when the ten coils are removed from the B field in an amount of time t
no force (right hand rule)
d/2
KQ/r
(EMF)Rt/10

28. third kinematic
V^2=(Vo)^2 +2a*change in x
m(v^2)/qvB
d/2
h/wavelength

29. formula for power with current and voltage
VI
nSintheta=nsintheta
.5CV^2 or .5 Q^2/C or .5QV
Joules/Columb

30. the electric force between two objects of charge Q
F/A
K |q||Q|/r^2
n(Cv)(deltaT)
no force (right hand rule)

31. heat required to change temperature of a substance
(EMF)Rt/10
no heat flow
MC(deltaT)
.5KA^2

32. type of collision where K is conserved
elastic collision
V^2=(Vo)^2 +2a*change in x
E/B
constant pressure

33. force of frction on an incline
roegh
mgCostheta(mu)d
qE
(V^2)/R

34. type of collision where objects stick togerther
h(Fo)
1/4wavelength
.5KA^2
perfectly inelastic collision

35. electric field in a distance r from a charge
k|Q|/r^2
Q=CV
roeVg
(1/Do) + (1/Di) = (1/f)

36. formula for energy of a spring mass when spring is neither at maximum displacement nor at equilibrium
L -LCostheta
KQ/r
MC(deltaT)
.5mV^2 + .5KA^2

37. snells law
FV
(I^2)R
nSintheta=nsintheta
(V^2)/r

38. force of friction
(Fn)(mu)
qE
M(Lf)
.5CV^2 or .5 Q^2/C or .5QV

39. energy of a photon if wavelength is known
BLv
hc/wavelength
rF
Q=CV

40. velocity of an electrion as it exitws from the hole
constant volume
qrB/m
AV=(A2)(V2)
sqrt(3KT/m)

41. formula for centripetal acceleration
roeVg
(V^2)/r
opposite motion
qV

42. isothermal
no temp change
(N2)/(N1)
(1/Do) + (1/Di) = (1/f)
(I^2)RT

43. adibatic
no heat flow
hc/wavelength
deltaU -deltaW
no temp change

44. force a charge in a Bfield
e=mc^2
delta x = (Vo)t + .5at^2
opposite motion
qVB

45. natural frequency of a closed tube of length L
VI
.5mV^2 + .5KA^2
roegh
1/4wavelength

46. second kinematic
qVB
delta x = (Vo)t + .5at^2
no temp change
no force (right hand rule)

47. velocity of a charge traveling at a constant veloc ity through crossed E and B fields
d/2
2nt=mwavelength
E/B
perfectly inelastic collision

48. formula for the wavelength (debroglie wavelength) of a moving particle
mgCostheta(mu)d
h/mv
1/2wavelength
constant pressure

49. voltage induced in a rod moving through a uniform magnetic field
(I^2)RT
0
BLv
mgCostheta(mu)d

50. hooke's law force of a spring
-KA
e=mc^2
qrB/m
KI/r

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AP Physics Formulas

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