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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. vrms (2 equations)
Vab=Rated voltage-IR (r=internal resistance)
v3kT/m [mass per molecule] - v3RT/M [molar mass]
in series - measures current - low resistance
Force of Friction

2. T = 1/f
Flux (in webers)=Bcos?A
Period in General
?U=W - no heat added system (Q=0)
F=ma

3. The three kinematics equations
rho=m/v
F=Gm1m2/r²
Efficiency of an Ideal Engine
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit

4. W
sum of voltages must be zero
Fnet=Fb-Fg
273K and 1.013E5 pa
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion

5. Force on a current carrying wire in a magnetic field
Work
F=kx
Fb=mf g= rhof Vf g
F=BIL

6. Net force/apparent weight in forces
Fnet=Fb-Fg
Archimedes Principle/Bouyancy
Efficiency of an Ideal Engine
Flux (in webers)=Bcos?A

7. Capacitors in parallel
V=constant - Q=added - C=added
Power from Energy
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
SG=rho object/10³

8. EMF (two formulas)
E=-N Change in flux/?t=Blv (v=velocity of the wire)
Ideal Gas Law
Temperature is constant - ?U=0 - -Q=W
Gravitational Potential Energy Anywhere

9. F(friction) = µN
Force of Friction
T=2pvl/g
T=2pvm/k
Adiabatic and isothermal processes ec= TH-TL/

10. Simple harmonic motion - pendulum
P=mv (Kg m/s) or (N s)
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
Momentum
T=2pvl/g

11. Hookes law
v3kT/m [mass per molecule] - v3RT/M [molar mass]
V=Ed
General Pressure
F=kx

12. Power - simple formula (mechanics)
General Pressure
P=W/T=FD/T=FV
Force of Gravity
Sum of all currents (I) entering=sum of all currents (I) leaving

13. Couloms law (force between two charged objects)
F=kQ1Q2/r² BREAK INTO VECTORS
Fnet=Fb-Fg
V=IR
Ug= Gm1m2/r

14. Ideal gas laws
Power from Energy
?P=rho(g)?h
Vab=Rated voltage-IR (r=internal resistance)
PV=nRT - PV=N (# of molecules)kb (bozons constant)T

15. PE of a spring
Ft=0
Kinematic with Velocity - Acceleration - and Time
on a solenoid wrap finger around direction of current - thumb will point in north pole direction
PE=1/2kx²

16. v² = v0² + 2a(x-x0)
Adiabatic and isothermal processes ec= TH-TL/
T=2pr/v
Power from Energy
Kinematic with Velocity - Acceleration - and Displacement

17. Thermal expansion
F=ma
?L=(coefficient of linear expansion)aLinitial?T
Period in General
Power from Energy

18. Net force/apparent weight broken done
General Pressure
V=vFt/(m/l)
counterclockwise
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal

19. Energy in a capacitor
a=v²/r
Ft=0
Force of Spring
1/2QV=U

20. 2nd right hand rule
added in parallel - measures volts - high resistance
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
Period in General
on a solenoid wrap finger around direction of current - thumb will point in north pole direction

21. On an inclined plane - gravity in the y
SG=rho object/10³
Fgy=FgSin?
Sum of all currents (I) entering=sum of all currents (I) leaving
Fx=mv²/r=FnSin?

22. Centripetal force
V=W/Q=KQ/r NO VECTORS
f=mv²/r
T=2pr/v
Bernoulli Principal

23. Ammeter
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
in series - measures current - low resistance
Continuity
Kavg=(3/2)kbT

24. Negative torque
Pressure from Depth
clockwise
QH=QL +W and e=W/QH
V=constant - I=added - R=1/r added

25. Period for a spring in simple harmonic motion
L=n/2?
T=2pvm/k
T=2pvl/g
Kinematic with Displacement - Velocity - Acceleration - and Time

26. Standard pressure and temperature and pressure
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
Centripetal Acceleration
273K and 1.013E5 pa
Pin=Pout=Fin/Ain=Fout/Aout

27. Specific gravity
v3kT/m [mass per molecule] - v3RT/M [molar mass]
SG=rho object/10³
px and py are conserved
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh

28. Absolute pressure
rho=m/v
A1V1=A2V2
P=Patm + rho g h
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field

29. Natural frequency open tube/not in a tub
Bernoulli Principal
?v=0 - w=0 area under the curve is zero
L=n/2?
sum of voltages must be zero

30. Dialectrics insulating sheet between plates
Sum of all currents (I) entering=sum of all currents (I) leaving
Fgx=FgCos?
C=KepA/d
Spring Potential Energy

31. P = F/A
q=K?AT/L
P=IV
General Pressure
Thermal Conductivity

32. F-F or NF-NF
C=KepA/d
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Bernoulli Principal
Work

33. Change in pressure
?P=rho(g)?h
Efficiency of an Ideal Engine
Pressure is constant ?P=0 w=-P?V
Constructive: 2t=m?+1/2? - Destructive: 2t=m?

34. Carnot engine
P=Patm + rho g h
clockwise
Adiabatic and isothermal processes ec= TH-TL/
Kinetic Energy

35. e = (T(hot) - T(cold))/T(hot)
Spring Potential Energy
Efficiency of an Ideal Engine
Force of Friction
Kinetic Energy

36. P = Fvcos?
Fny=FnCos?
Power from Force
Ideal Gas Law
F=BIL

37. torque
moment arm - perpendicular distance from the force to the axis of rotation
T=2pvm/k
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
Kinematic with Velocity - Acceleration - and Time

38. p = mv
F=BIL
Momentum
A1V1=A2V2
F=kQ1Q2/r² BREAK INTO VECTORS

39. Momentum
L=n/2?
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
P=mv (Kg m/s) or (N s)
Bernoulli Principal

40. heat flow through a window or door
273K and 1.013E5 pa
n1sin?1=n2sin?2
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
q=K?AT/L

41. Pressure (2 formulas)
F=Gm1m2/r²
P=F/A=rho(g)h
General Pressure
n1sin?1=n2sin90

42. Force buoyancy (2 formulas)
px and py are conserved
Flux (in webers)=Bcos?A
billiard balls - no sticking total energy is conserved
Fb=mf g= rhof Vf g

43. Velocity of sound in a strong
Fnx=FnSin?
V=vFt/(m/l)
Force of Friction
q=K?AT/L

44. v = v0 + at
?P=rho(g)?h
Kinematic with Velocity - Acceleration - and Time
V=W/Q=KQ/r NO VECTORS
Centripetal Acceleration

45. K = ½mv²
Fnet=Fb-Fg
Kinetic Energy
?U=Q + W - heat added= heat + work
Average Speed of each Molecule

46. Magnitude of gravitational forces between objects
V=constant - I=added - R=1/r added
V=added - I=constant - R= added
F=Gm1m2/r²
Sum of all currents (I) entering=sum of all currents (I) leaving

47. Isobaric process
Pressure is constant ?P=0 w=-P?V
counterclockwise
1ev=1.6E-19J
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion

48. Period for a pendulum in simple harmonic motion
KE=1/2mv²
T=2pvl/g
Fnet=Fb-Fg
Fgy=FgSin?

49. Kirchhoffs loop rule [conservation of energy]
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
f=mv²/r
sum of voltages must be zero
?U=Q + W - heat added= heat + work

50. Kinetic energy
Centripetal Acceleration
?v=0 - w=0 area under the curve is zero
KE=1/2mv²
Thermal Conductivity