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AP Physics B: Formulas

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Resistivity in a wire
F=kQ1Q2/r² BREAK INTO VECTORS
F=kx
R=rho L/A A=cross sectional area
q=K?AT/L

2. Series Circuits
V=added - I=constant - R= added
Flux (in webers)=Bcos?A
General Pressure
Constructive: 2t=m? - Destructive: 2t=m?+1/2?

3. Positive torque
Ideal Gas Law
counterclockwise
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Sum of all currents (I) entering=sum of all currents (I) leaving

4. Isovolumetric/isochoric
Archimedes Principle/Bouyancy
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
Flux (in webers)=Bcos?A
?v=0 - w=0 area under the curve is zero

5. Parallel Circuits
I=?q/?t
Centripetal Acceleration
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
V=constant - I=added - R=1/r added

6. Isobaric process
V=W/Q=KQ/r NO VECTORS
Kinematic with Displacement - Velocity - Acceleration - and Time
Pressure is constant ?P=0 w=-P?V
L=n/4? has to be odd numbers

7. Kinetic energy
added in parallel - measures volts - high resistance
KE=1/2mv²
Kinematic with Displacement - Velocity - Acceleration - and Time
Average Molecular Kinetic Energy

8. Voltage across a battery terminal
n1sin?1=n2sin90
Vab=Rated voltage-IR (r=internal resistance)
Ug= Gm1m2/r
Period in General

9. F-NF or vice versa
C=KepA/d
Flux (in webers)=Bcos?A
v3kT/m [mass per molecule] - v3RT/M [molar mass]
Constructive: 2t=m?+1/2? - Destructive: 2t=m?

10. Velocity of sound in a strong
V=vFt/(m/l)
P=IV
W=KEf-KEi
Centripetal Acceleration

11. Change in pressure
L=n/2?
?P=rho(g)?h
E=-N Change in flux/?t=Blv (v=velocity of the wire)
Vab=Rated voltage-IR (r=internal resistance)

12. Capacitors in parallel
F=kQ1Q2/r² BREAK INTO VECTORS
V=constant - Q=added - C=added
L=n/4? has to be odd numbers
T=2pvm/k

13. Kirchhoffs Junction rule
?L=(coefficient of linear expansion)aLinitial?T
Fy=FnCos?-Fg
Momentum
Sum of all currents (I) entering=sum of all currents (I) leaving

14. v = v0 + at
Fnet=Fb-Fg
Kinetic Energy
Kinematic with Velocity - Acceleration - and Time
Ft=0

15. Current
1ev=1.6E-19J
I=?q/?t
px and py are conserved
T=2pvl/g

16. Momentum
P=mv (Kg m/s) or (N s)
?L=(coefficient of linear expansion)aLinitial?T
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
clockwise

17. On an inclined plane - gravity in the y
Flux (in webers)=Bcos?A
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
Fgy=FgSin?
Vab=Rated voltage-IR (r=internal resistance)

18. Period for circular motion
T=2pr/v
R=rho L/A A=cross sectional area
Fnx=FnSin?
counterclockwise

19. Flux
Average Speed of each Molecule
Flux (in webers)=Bcos?A
SG=rho object/10³
Efficiency of a Heat Engine

20. vrms (2 equations)
Ft=0
v3kT/m [mass per molecule] - v3RT/M [molar mass]
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
273K and 1.013E5 pa

21. Period for a spring in simple harmonic motion
T=2pvm/k
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
Pressure is constant ?P=0 w=-P?V
Kavg=(3/2)kbT

22. Negative torque
Fx=mv²/r=FnSin?
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
n1sin?1=n2sin?2
clockwise

23. P + pgy + ½pv² = const.
px and py are conserved
Kinetic Energy
Bernoulli Principal
Fy=FnCos?-Fg

24. F(spring) = -kx
Temperature is constant - ?U=0 - -Q=W
Force of Spring
T=2pvm/k
Continuity

25. Couloms law (force between two charged objects)
V=constant - Q=added - C=added
Kinematic with Velocity - Acceleration - and Displacement
F=kQ1Q2/r² BREAK INTO VECTORS
I=?q/?t

26. PV = nRT = NkT
moment arm - perpendicular distance from the force to the axis of rotation
Ideal Gas Law
V=constant - I=added - R=1/r added
1/2QV=U

27. Voltage-charges formula (2)
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
Pressure is constant ?P=0 w=-P?V
V=W/Q=KQ/r NO VECTORS
f=mv²/r

28. Force buoyancy (2 formulas)
PE=1/2kx²
Period in General
Fb=mf g= rhof Vf g
added in parallel - measures volts - high resistance

29. a(centripetal) = v²/r
Centripetal Acceleration
Fgx=FgCos?
V=Ed
Q=CV

30. Power - simple formula (mechanics)
P=W/T=FD/T=FV
moment arm - perpendicular distance from the force to the axis of rotation
?L=(coefficient of linear expansion)aLinitial?T
Force of Spring

31. Dialectrics insulating sheet between plates
Bernoulli Principal
C=KepA/d
?P=rho(g)?h
T=2pvl/g

32. F-F or NF-NF
Bernoulli Principal
Ideal Gas Law
V=added - Q=constant - C= 1/C
Constructive: 2t=m? - Destructive: 2t=m?+1/2?

33. P = F/A
px and py are conserved
n1sin?1=n2sin90
General Pressure
in series - measures current - low resistance

34. Force on a current carrying wire in a magnetic field
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
P=mv (Kg m/s) or (N s)
F=ma
F=BIL

35. P = Fvcos?
Power from Force
q=K?AT/L
Ft=0
Fny=FnCos?

36. Power (circuts)
n1sin?1=n2sin90
Sum of all currents (I) entering=sum of all currents (I) leaving
P=IV
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field

37. Capacitance
Power from Force
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
Q=CV
P=F/A=rho(g)h

38. F(gravity) = -(Gm1m2/r²)
Spring Potential Energy
Force of Gravity
T=2pvm/k
on a solenoid wrap finger around direction of current - thumb will point in north pole direction

39. Ideal gas laws
Efficiency of an Ideal Engine
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
V=added - I=constant - R= added
Pressure from Depth

40. Energy in a capacitor
a=v²/r
px and py are conserved
Fnx=FnSin?
1/2QV=U

41. Adiabatic process
P=F/A=rho(g)h
Fx=mv²/r=FnSin?
C=KepA/d
?U=W - no heat added system (Q=0)

42. On a banked curve in circular motion - Fn in the y is
Average Molecular Kinetic Energy
Ft=0
W=Fd=mad - direction of force must be same as direction of distance
Fny=FnCos?

43. H = (kA?T)/L
Thermal Conductivity
Vab=Rated voltage-IR (r=internal resistance)
Power from Energy
F=BIL

44. x = x0 + v0t + ½at²
Ft=0
V=?f
273K and 1.013E5 pa
Kinematic with Displacement - Velocity - Acceleration - and Time

45. U(gravitational) = -(Gm1m2/r)
V=constant - Q=added - C=added
T=2pr/v
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Gravitational Potential Energy Anywhere

46. P = P0 + pgh
V=W/Q=KQ/r NO VECTORS
PE=1/2kx²
V=constant - I=added - R=1/r added
Pressure from Depth

47. Force on a charged particle in a magnetic field
Archimedes Principle/Bouyancy
F=Bvsin?q
Kinematic with Velocity - Acceleration - and Displacement
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS

48. Centripetal acceleration
a=v²/r
F=kQ1Q2/r² BREAK INTO VECTORS
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
F=Bvsin?q

49. Specific gravity
1ev=1.6E-19J
F=kQ1Q2/r² BREAK INTO VECTORS
SG=rho object/10³
billiard balls - no sticking total energy is conserved

50. T = 1/f
Pin=Pout=Fin/Ain=Fout/Aout
Period in General
counterclockwise
Pressure is constant ?P=0 w=-P?V