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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. Momentum
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
P=mv (Kg m/s) or (N s)
Kinematic with Velocity - Acceleration - and Displacement
Kinetic Energy

2. Basic thermo equation
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
q=K?AT/L
Kavg=(3/2)kbT
?U=Q + W - heat added= heat + work

3. Voltmeter
Gravitational Potential Energy Anywhere
PE=1/2kx²
added in parallel - measures volts - high resistance
clockwise

4. Force on a charged particle in a magnetic field
F=Bvsin?q
V=added - Q=constant - C= 1/C
Average Molecular Kinetic Energy
Constructive: 2t=m? - Destructive: 2t=m?+1/2?

5. p = mv
Centripetal Acceleration
W=KEf-KEi
Momentum
V=constant - I=added - R=1/r added

6. heat flow through a window or door
q=K?AT/L
V=(331 +.6T) T=temp in Celsius
Fny=FnCos?
Kinematic with Velocity - Acceleration - and Time

7. Velocity of a wave
V=?f
F=Bvsin?q
moment arm - perpendicular distance from the force to the axis of rotation
Vab=Rated voltage-IR (r=internal resistance)

8. Absolute pressure
?P=rho(g)?h
Average Speed of each Molecule
px and py are conserved
P=Patm + rho g h

9. Capacitance
Efficiency of an Ideal Engine
Q=CV
Fnet=Fb-Fg
T=2pvl/g

10. W
Fb=mf g= rhof Vf g
Flux (in webers)=Bcos?A
L=n/4? has to be odd numbers
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion

11. Banked curve - sum of the forces in the x
V=IR
Fx=mv²/r=FnSin?
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
Fgy=FgSin?

12. Simple harmonic motion - spring
Average Speed of each Molecule
T=2pvm/k
Thermal Conductivity
F=Bvsin?q

13. Power - simple formula (mechanics)
T=2pvl/g
P=W/T=FD/T=FV
Efficiency of a Heat Engine
sum of voltages must be zero

14. PV = nRT = NkT
Ideal Gas Law
Flux (in webers)=Bcos?A
General Pressure
P=W/T=FD/T=FV

15. Average kinetic energy
Fgx=FgCos?
f=mv²/r
Kavg=(3/2)kbT
Efficiency of a Heat Engine

16. snells law
Force of Spring
n1sin?1=n2sin?2
P=W/T=FD/T=FV
in series - measures current - low resistance

17. On an inclined plane - gravity in the x
Pressure from Depth
Archimedes Principle/Bouyancy
Fgx=FgCos?
F=Bvsin?q

18. Capacitors in parallel
Power from Force
V=constant - Q=added - C=added
V=W/Q=KQ/r NO VECTORS
R=rho L/A A=cross sectional area

19. Isovolumetric/isochoric
Fgx=FgCos?
clockwise
?v=0 - w=0 area under the curve is zero
C=KepA/d

20. F-NF or vice versa
Work
Kinematic with Velocity - Acceleration - and Time
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
Continuity

21. On a banked curve in circular motion - Fn in the y is
L=n/2?
Fny=FnCos?
I=?q/?t
F=ma

22. Kinetic energy
Fb=mf g= rhof Vf g
KE=1/2mv²
Ug= Gm1m2/r
Pressure is constant ?P=0 w=-P?V

23. W = F?rcos?
Work
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
Pressure from Depth
SG=rho object/10³

24. 3rd right hand rule
?v=0 - w=0 area under the curve is zero
1/2QV=U
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
V=constant - Q=added - C=added

25. On an inclined plane - gravity in the y
P=mv (Kg m/s) or (N s)
W=KEf-KEi
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
Fgy=FgSin?

26. Natural frequency open tube/not in a tub
F=Gm1m2/r²
1/2QV=U
L=n/2?
W=Fd=mad - direction of force must be same as direction of distance

27. Couloms law (force between two charged objects)
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
Fx=mv²/r=FnSin?
?v=0 - w=0 area under the curve is zero
F=kQ1Q2/r² BREAK INTO VECTORS

28. Centripetal force
T=2pvm/k
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
f=mv²/r
Centripetal Acceleration

29. Net work
T=2pvl/g
V=constant - I=added - R=1/r added
W=KEf-KEi
Kinetic Energy

30. Simple density formula
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
billiard balls - no sticking total energy is conserved
rho=m/v
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal

31. Adiabatic process
?U=W - no heat added system (Q=0)
q=K?AT/L
rho=m/v
T=2pr/v

32. Critical speed is
on a solenoid wrap finger around direction of current - thumb will point in north pole direction
Ft=0
V=Ed
moment arm - perpendicular distance from the force to the axis of rotation

33. F-F or NF-NF
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
R=rho L/A A=cross sectional area
Force of Friction
F=BIL

34. Pascals principle
Fb=mf g= rhof Vf g
Vab=Rated voltage-IR (r=internal resistance)
Pin=Pout=Fin/Ain=Fout/Aout
F=Bvsin?q

35. Specific gravity
Power from Force
SG=rho object/10³
Pin=Pout=Fin/Ain=Fout/Aout
Work

36. Isothermal process
?U=Q + W - heat added= heat + work
Kinematic with Displacement - Velocity - Acceleration - and Time
Temperature is constant - ?U=0 - -Q=W
Kavg=(3/2)kbT

37. Impulse
General Pressure
V=W/Q=KQ/r NO VECTORS
P=W/T=FD/T=FV
J=?vm=F?t

38. F(spring) = -kx
Pressure is constant ?P=0 w=-P?V
Force of Spring
E=-N Change in flux/?t=Blv (v=velocity of the wire)
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal

39. v = v(3RT)/M = v(3KT)/µ
Average Speed of each Molecule
?L=(coefficient of linear expansion)aLinitial?T
Continuity
Kinematic with Velocity - Acceleration - and Displacement

40. P = Fvcos?
PE=mgh
1/2QV=U
T=2pvl/g
Power from Force

41. Force buoyancy (2 formulas)
Fx=mv²/r=FnSin?
Fb=mf g= rhof Vf g
Work
Momentum

42. x = x0 + v0t + ½at²
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
v3kT/m [mass per molecule] - v3RT/M [molar mass]
Kinematic with Displacement - Velocity - Acceleration - and Time
273K and 1.013E5 pa

43. Force on a current carrying wire in a magnetic field
Force of Friction
F=BIL
Fb=mf g= rhof Vf g
Fnx=FnSin?

44. Voltage-charges formula (2)
Momentum
PE=1/2kx²
V=W/Q=KQ/r NO VECTORS
Q=CV

45. e = abs(W/Q)
Archimedes Principle/Bouyancy
Fb=mf g= rhof Vf g
T=2pvm/k
Efficiency of a Heat Engine

46. Potential energy
V=added - Q=constant - C= 1/C
Force of Friction
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
PE=mgh

47. Capacitors in series
V=vFt/(m/l)
V=added - Q=constant - C= 1/C
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
Power from Force

48. K = ½mv²
rho=m/v
Kinetic Energy
Efficiency of a Heat Engine
Pressure from Depth

49. Isobaric process
Flux (in webers)=Bcos?A
in series - measures current - low resistance
Efficiency of an Ideal Engine
Pressure is constant ?P=0 w=-P?V

50. Vectors in momentum
Fny=FnCos?
px and py are conserved
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field