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AP Physics B: Formulas

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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
sum of voltages must be zero
R=rho L/A A=cross sectional area
Period in General
P=mv (Kg m/s) or (N s)

2. On a banked curve in circular motion - Fn in the y is
V=?f
Pin=Pout=Fin/Ain=Fout/Aout
Period in General
Fny=FnCos?

3. snells law
F=Gm1m2/r²
J=?vm=F?t
273K and 1.013E5 pa
n1sin?1=n2sin?2

4. K = (3/2)kT
Temperature is constant - ?U=0 - -Q=W
V=vFt/(m/l)
Average Molecular Kinetic Energy
Pressure is constant ?P=0 w=-P?V

5. Total internal reflection
n1sin?1=n2sin90
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
Continuity

6. Period for a pendulum in simple harmonic motion
Efficiency of an Ideal Engine
F=ma
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
T=2pvl/g

7. F(spring) = -kx
Force of Spring
?U=W - no heat added system (Q=0)
clockwise
V=W/Q=KQ/r NO VECTORS

8. Electric field intensity
a=v²/r
Kinematic with Velocity - Acceleration - and Displacement
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
Efficiency of a Heat Engine

9. Force on a current carrying wire in a magnetic field
Sum of all currents (I) entering=sum of all currents (I) leaving
Kinematic with Velocity - Acceleration - and Displacement
F=BIL
P=W/T=FD/T=FV

10. Isobaric process
?v=0 - w=0 area under the curve is zero
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
1/2QV=U
Pressure is constant ?P=0 w=-P?V

11. r in torque
W=KEf-KEi
moment arm - perpendicular distance from the force to the axis of rotation
counterclockwise
added in parallel - measures volts - high resistance

12. torque
?v=0 - w=0 area under the curve is zero
F=kQ1Q2/r² BREAK INTO VECTORS
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
V=constant - I=added - R=1/r added

13. F(buoy) = pVg
px and py are conserved
Force of Spring
Archimedes Principle/Bouyancy
Power from Energy

14. Kirchhoffs Junction rule
added in parallel - measures volts - high resistance
Efficiency of an Ideal Engine
Force of Gravity
Sum of all currents (I) entering=sum of all currents (I) leaving

15. Power - simple formula (mechanics)
Kinematic with Velocity - Acceleration - and Displacement
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
P=W/T=FD/T=FV
n1sin?1=n2sin90

16. F-F or NF-NF
QH=QL +W and e=W/QH
Pressure is constant ?P=0 w=-P?V
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Fny=FnCos?

17. Pressure (2 formulas)
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
P=F/A=rho(g)h
?P=rho(g)?h
Momentum

18. Period for circular motion
Period in General
V=IR
T=2pr/v
Fgx=FgCos?

19. Kinetic energy
n1sin?1=n2sin90
KE=1/2mv²
?U=Q + W - heat added= heat + work
SG=rho object/10³

20. Change in pressure
?P=rho(g)?h
T=2pvl/g
P=Patm + rho g h
Archimedes Principle/Bouyancy

21. Centripetal acceleration
a=v²/r
P=IV
QH=QL +W and e=W/QH
counterclockwise

22. Specific gravity
J=?vm=F?t
Force of Friction
Fy=FnCos?-Fg
SG=rho object/10³

23. Impulse
J=?vm=F?t
P=IV
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
Ft=0

24. On an inclined plane - gravity in the y
Fgy=FgSin?
V=constant - I=added - R=1/r added
Fnet=Fb-Fg
Momentum

25. Positive torque
Kinematic with Velocity - Acceleration - and Time
sum of voltages must be zero
counterclockwise
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field

26. heat flow through a window or door
W=KEf-KEi
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
Efficiency of a Heat Engine
q=K?AT/L

27. Net force/apparent weight broken done
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
Pressure is constant ?P=0 w=-P?V
W=Fd=mad - direction of force must be same as direction of distance

28. PV = nRT = NkT
Ideal Gas Law
L=n/2?
273K and 1.013E5 pa
Force of Spring

29. Vsound
Fy=FnCos?-Fg
Gravitational Potential Energy Anywhere
A1V1=A2V2
V=(331 +.6T) T=temp in Celsius

30. U(spring) = ½kx²
Fny=FnCos?
Spring Potential Energy
n1sin?1=n2sin90
Bernoulli Principal

31. Ideal gas laws
PE=mgh
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
T=2pvm/k
Kinetic Energy

32. U(gravitational) = -(Gm1m2/r)
Gravitational Potential Energy Anywhere
V=W/Q=KQ/r NO VECTORS
Flux (in webers)=Bcos?A
?L=(coefficient of linear expansion)aLinitial?T

33. P + pgy + ½pv² = const.
?P=rho(g)?h
Bernoulli Principal
W=KEf-KEi
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field

34. K = ½mv²
Kinetic Energy
Force of Spring
V=Ed
Period in General

35. Force on a charged particle in a magnetic field
counterclockwise
F=Bvsin?q
Temperature is constant - ?U=0 - -Q=W
?P=rho(g)?h

36. Carnot engine
V=Ed
?U=Q + W - heat added= heat + work
Adiabatic and isothermal processes ec= TH-TL/
T=2pvl/g

37. Parallel Circuits
V=constant - I=added - R=1/r added
Q=CV
F=kQ1Q2/r² BREAK INTO VECTORS
Spring Potential Energy

38. The three kinematics equations
General Pressure
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
Period in General

39. Absolute pressure
P=Patm + rho g h
Fgx=FgCos?
v3kT/m [mass per molecule] - v3RT/M [molar mass]
a=v²/r

40. P = F/A
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
Fnx=FnSin?
Average Speed of each Molecule
General Pressure

41. Centripetal force
f=mv²/r
Q=CV
Kinematic with Velocity - Acceleration - and Time
General Pressure

42. e = abs(W/Q)
Ft=0
Kinematic with Velocity - Acceleration - and Time
Efficiency of a Heat Engine
Q=CV

43. Force buoyancy (2 formulas)
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
q=K?AT/L
Fb=mf g= rhof Vf g
Continuity

44. Velocity of a wave
Bernoulli Principal
V=?f
Pressure from Depth
q=K?AT/L

45. Critical speed is
Ideal Gas Law
Ft=0
Efficiency of a Heat Engine
rho=m/v

46. Elastic collision
moment arm - perpendicular distance from the force to the axis of rotation
billiard balls - no sticking total energy is conserved
?U=W - no heat added system (Q=0)
t=Fr - force must be perpendicular to the moment arm and the axis of rotation

47. F(friction) = µN
Force of Friction
Power from Energy
F=BIL
Force of Gravity

48. Voltage-charges formula (2)
I=?q/?t
Force of Gravity
V=W/Q=KQ/r NO VECTORS
R=rho L/A A=cross sectional area

49. W = F?rcos?
Ideal Gas Law
Work
Fgx=FgCos?
?v=0 - w=0 area under the curve is zero

50. Capacitance
a=v²/r
Q=CV
273K and 1.013E5 pa
Period in General

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AP Physics B: Formulas

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