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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. On an inclined plane - gravity in the x
Fgx=FgCos?
T=2pvl/g
V=(331 +.6T) T=temp in Celsius
V=vFt/(m/l)

2. Momentum
px and py are conserved
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
in series - measures current - low resistance
P=mv (Kg m/s) or (N s)

3. Velocity of a wave
Average Molecular Kinetic Energy
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
V=?f

4. A1V1 = A2V2
Efficiency of an Ideal Engine
clockwise
Continuity
in series - measures current - low resistance

5. e = (T(hot) - T(cold))/T(hot)
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
Efficiency of an Ideal Engine
SG=rho object/10³
moment arm - perpendicular distance from the force to the axis of rotation

6. W = F?rcos?
Work
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
Flux (in webers)=Bcos?A
V=W/Q=KQ/r NO VECTORS

7. The three kinematics equations
R=rho L/A A=cross sectional area
Force of Gravity
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit

8. 3rd right hand rule
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
V=?f
clockwise
Fy=FnCos?-Fg

9. Centripetal force
SG=rho object/10³
f=mv²/r
a=v²/r
E=-N Change in flux/?t=Blv (v=velocity of the wire)

10. PE of a spring
F=Bvsin?q
a=v²/r
PE=1/2kx²
J=?vm=F?t

11. snells law
a=v²/r
Power from Force
counterclockwise
n1sin?1=n2sin?2

12. F(gravity) = -(Gm1m2/r²)
Force of Gravity
P=Patm + rho g h
R=rho L/A A=cross sectional area
P=mv (Kg m/s) or (N s)

13. Isovolumetric/isochoric
W=Fd=mad - direction of force must be same as direction of distance
Efficiency of an Ideal Engine
Pressure from Depth
?v=0 - w=0 area under the curve is zero

14. Standard pressure and temperature and pressure
Kinematic with Velocity - Acceleration - and Displacement
273K and 1.013E5 pa
Force of Spring
Gravitational Potential Energy Anywhere

15. Potential energy
Flux (in webers)=Bcos?A
W=KEf-KEi
PE=mgh
?v=0 - w=0 area under the curve is zero

16. Kinetic energy
Kavg=(3/2)kbT
V=Ed
KE=1/2mv²
?U=W - no heat added system (Q=0)

17. e = abs(W/Q)
F=kx
added in parallel - measures volts - high resistance
V=Ed
Efficiency of a Heat Engine

18. vrms (2 equations)
Bernoulli Principal
KE=1/2mv²
P=Patm + rho g h
v3kT/m [mass per molecule] - v3RT/M [molar mass]

19. Basic thermo equation
Efficiency of a Heat Engine
P=mv (Kg m/s) or (N s)
273K and 1.013E5 pa
?U=Q + W - heat added= heat + work

20. 1st right hand rule
Continuity
Flux (in webers)=Bcos?A
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
n1sin?1=n2sin90

21. Capacitors in series
F=Bvsin?q
?P=rho(g)?h
V=added - Q=constant - C= 1/C
Spring Potential Energy

22. Capacitance
Q=CV
W=KEf-KEi
R=rho L/A A=cross sectional area
billiard balls - no sticking total energy is conserved

23. Net work
V=constant - Q=added - C=added
Average Molecular Kinetic Energy
W=KEf-KEi
L=n/2?

24. Electron volts
Centripetal Acceleration
Efficiency of an Ideal Engine
F=kx
1ev=1.6E-19J

25. Net force/apparent weight in forces
Fnet=Fb-Fg
Pressure from Depth
Fnx=FnSin?
Average Molecular Kinetic Energy

26. Change in pressure
V=constant - Q=added - C=added
P=IV
L=n/4? has to be odd numbers
?P=rho(g)?h

27. On an inclined plane - gravity in the y
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
Fgy=FgSin?
Kinetic Energy
Gravitational Potential Energy Anywhere

28. Voltage across a battery terminal
Efficiency of a Heat Engine
QH=QL +W and e=W/QH
Vab=Rated voltage-IR (r=internal resistance)
V=vFt/(m/l)

29. Net force/apparent weight broken done
?L=(coefficient of linear expansion)aLinitial?T
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
Pressure from Depth

30. Voltage-charges formula (2)
Gravitational Potential Energy Anywhere
V=W/Q=KQ/r NO VECTORS
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
F=ma

31. F(buoy) = pVg
on a solenoid wrap finger around direction of current - thumb will point in north pole direction
P=mv (Kg m/s) or (N s)
Fnet=Fb-Fg
Archimedes Principle/Bouyancy

32. Dialectrics insulating sheet between plates
P=F/A=rho(g)h
A1V1=A2V2
C=KepA/d
Ideal Gas Law

33. F-F or NF-NF
Q=CV
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Flux (in webers)=Bcos?A
F=kQ1Q2/r² BREAK INTO VECTORS

34. P = F/A
SG=rho object/10³
Fnet=Fb-Fg
F=Gm1m2/r²
General Pressure

35. Resistivity in a wire
T=2pr/v
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
?L=(coefficient of linear expansion)aLinitial?T
R=rho L/A A=cross sectional area

36. Elastic collision
Fy=FnCos?-Fg
billiard balls - no sticking total energy is conserved
Vab=Rated voltage-IR (r=internal resistance)
Thermal Conductivity

37. On a banked curve in circular motion - Fn in the x is
Pin=Pout=Fin/Ain=Fout/Aout
Fnx=FnSin?
px and py are conserved
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal

38. Parallel Circuits
V=constant - I=added - R=1/r added
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
J=?vm=F?t
Fy=FnCos?-Fg

39. F(friction) = µN
Force of Friction
V=(331 +.6T) T=temp in Celsius
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
rho=m/v

40. W
Kinematic with Velocity - Acceleration - and Displacement
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Ft=0

41. Centripetal acceleration
a=v²/r
P=mv (Kg m/s) or (N s)
QH=QL +W and e=W/QH
Flux (in webers)=Bcos?A

42. Voltage (circuts)
P=F/A=rho(g)h
Force of Spring
V=IR
P=mv (Kg m/s) or (N s)

43. natural frequencies in a closed tube
F=kQ1Q2/r² BREAK INTO VECTORS
Pin=Pout=Fin/Ain=Fout/Aout
L=n/4? has to be odd numbers
QH=QL +W and e=W/QH

44. Continuity equation [Conservation of mass]
?v=0 - w=0 area under the curve is zero
V=constant - Q=added - C=added
Work
A1V1=A2V2

45. Kirchhoffs Junction rule
Fnet=Fb-Fg
P=W/T=FD/T=FV
Kinetic Energy
Sum of all currents (I) entering=sum of all currents (I) leaving

46. Ideal gas laws
F=kx
F=ma
in series - measures current - low resistance
PV=nRT - PV=N (# of molecules)kb (bozons constant)T

47. Capacitors in parallel
V=vFt/(m/l)
V=constant - Q=added - C=added
Power from Force
F=Bvsin?q

48. Velocity of sound in a strong
Thermal Conductivity
V=vFt/(m/l)
Efficiency of an Ideal Engine
1ev=1.6E-19J

49. P = Fvcos?
F=kQ1Q2/r² BREAK INTO VECTORS
Force of Spring
Power from Force
J=?vm=F?t

50. Couloms law (force between two charged objects)
W=Fd=mad - direction of force must be same as direction of distance
rho=m/v
F=kx
F=kQ1Q2/r² BREAK INTO VECTORS