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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. Banked curve - sum of the forces in the y
Fy=FnCos?-Fg
Kavg=(3/2)kbT
F=Bvsin?q
F=ma

2. P = Fvcos?
Efficiency of a Heat Engine
Power from Force
Sum of all currents (I) entering=sum of all currents (I) leaving
V=?f

3. vrms (2 equations)
n1sin?1=n2sin?2
v3kT/m [mass per molecule] - v3RT/M [molar mass]
px and py are conserved
L=n/2?

4. K = (3/2)kT
Average Molecular Kinetic Energy
Force of Spring
v3kT/m [mass per molecule] - v3RT/M [molar mass]
Fx=mv²/r=FnSin?

5. Magnitude of gravitational forces between objects
F=Gm1m2/r²
?P=rho(g)?h
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
Pin=Pout=Fin/Ain=Fout/Aout

6. Velocity of sound in a strong
V=vFt/(m/l)
E=-N Change in flux/?t=Blv (v=velocity of the wire)
SG=rho object/10³
Bernoulli Principal

7. Net work
F=Gm1m2/r²
F=kx
W=KEf-KEi
Kavg=(3/2)kbT

8. Simple force equation
f=mv²/r
F=ma
q=K?AT/L
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS

9. Thermal expansion
C=KepA/d
T=2pvm/k
?L=(coefficient of linear expansion)aLinitial?T
F=kQ1Q2/r² BREAK INTO VECTORS

10. Energy in a capacitor
Pressure from Depth
KE=1/2mv²
1/2QV=U
Fgx=FgCos?

11. Electron volts
F=ma
1ev=1.6E-19J
F=Bvsin?q
billiard balls - no sticking total energy is conserved

12. W = F?rcos?
Centripetal Acceleration
Q=CV
Average Molecular Kinetic Energy
Work

13. F(friction) = µN
Period in General
Force of Friction
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
Vab=Rated voltage-IR (r=internal resistance)

14. Voltage across a battery terminal
n1sin?1=n2sin90
Vab=Rated voltage-IR (r=internal resistance)
Kinetic Energy
T=2pvl/g

15. PV = nRT = NkT
Thermal Conductivity
Ideal Gas Law
General Pressure
P=mv (Kg m/s) or (N s)

16. Centripetal force
F=Bvsin?q
Fgy=FgSin?
f=mv²/r
F=Gm1m2/r²

17. Capacitance
Flux (in webers)=Bcos?A
T=2pr/v
Pressure from Depth
Q=CV

18. Resistivity in a wire
?U=Q + W - heat added= heat + work
R=rho L/A A=cross sectional area
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Fx=mv²/r=FnSin?

19. H = (kA?T)/L
Thermal Conductivity
F=kQ1Q2/r² BREAK INTO VECTORS
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
Fgx=FgCos?

20. Negative torque
clockwise
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
J=?vm=F?t
added in parallel - measures volts - high resistance

21. P(avg) = W/?t
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
I=?q/?t
R=rho L/A A=cross sectional area
Power from Energy

22. Simple harmonic motion - pendulum
T=2pvl/g
Average Speed of each Molecule
V=IR
General Pressure

23. Potential energy
KE=1/2mv²
PE=mgh
Fy=FnCos?-Fg
Average Molecular Kinetic Energy

24. Average kinetic energy
Kavg=(3/2)kbT
A1V1=A2V2
Work
Fgy=FgSin?

25. On an inclined plane - gravity in the x
q=K?AT/L
Fgx=FgCos?
Adiabatic and isothermal processes ec= TH-TL/
Thermal Conductivity

26. snells law
T=2pvl/g
Spring Potential Energy
n1sin?1=n2sin?2
273K and 1.013E5 pa

27. heat flow through a window or door
Period in General
W=Fd=mad - direction of force must be same as direction of distance
F=kx
q=K?AT/L

28. Elastic collision
E=-N Change in flux/?t=Blv (v=velocity of the wire)
P=F/A=rho(g)h
Force of Friction
billiard balls - no sticking total energy is conserved

29. Velocity of a wave
F=kQ1Q2/r² BREAK INTO VECTORS
Power from Energy
V=?f
L=n/4? has to be odd numbers

30. Total internal reflection
Efficiency of an Ideal Engine
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
rho=m/v
n1sin?1=n2sin90

31. Vectors in momentum
Fnet=Fb-Fg
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
px and py are conserved
Pin=Pout=Fin/Ain=Fout/Aout

32. Simple density formula
T=2pvm/k
rho=m/v
Fny=FnCos?
P=W/T=FD/T=FV

33. A1V1 = A2V2
L=n/4? has to be odd numbers
Continuity
F=Bvsin?q
V=IR

34. Centripetal acceleration
Kavg=(3/2)kbT
F=kx
a=v²/r
Bernoulli Principal

35. Banked curve - sum of the forces in the x
T=2pvl/g
Fx=mv²/r=FnSin?
V=added - Q=constant - C= 1/C
Force of Spring

36. Net force/apparent weight broken done
P=IV
Q=CV
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field

37. Couloms law (force between two charged objects)
T=2pvl/g
a=v²/r
billiard balls - no sticking total energy is conserved
F=kQ1Q2/r² BREAK INTO VECTORS

38. Specific gravity
P=mv (Kg m/s) or (N s)
T=2pvm/k
P=W/T=FD/T=FV
SG=rho object/10³

39. Flux
Flux (in webers)=Bcos?A
Fb=mf g= rhof Vf g
moment arm - perpendicular distance from the force to the axis of rotation
Spring Potential Energy

40. Standard pressure and temperature and pressure
273K and 1.013E5 pa
QH=QL +W and e=W/QH
Centripetal Acceleration
V=(331 +.6T) T=temp in Celsius

41. K = ½mv²
Kinetic Energy
Fgx=FgCos?
T=2pvl/g
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field

42. Work - simple formula
W=Fd=mad - direction of force must be same as direction of distance
KE=1/2mv²
PE=1/2kx²
L=n/4? has to be odd numbers

43. Force buoyancy (2 formulas)
1/2QV=U
Temperature is constant - ?U=0 - -Q=W
Fb=mf g= rhof Vf g
C=KepA/d

44. Change in pressure
sum of voltages must be zero
?P=rho(g)?h
Thermal Conductivity
P=W/T=FD/T=FV

45. Force on a charged particle in a magnetic field
Pressure is constant ?P=0 w=-P?V
I=?q/?t
F=Bvsin?q
q=K?AT/L

46. Power (circuts)
V=Ed
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
P=IV
F=kQ1Q2/r² BREAK INTO VECTORS

47. Voltage-parallel plates
I=?q/?t
V=added - I=constant - R= added
T=2pvm/k
V=Ed

48. v = v0 + at
?v=0 - w=0 area under the curve is zero
Kinematic with Velocity - Acceleration - and Time
px and py are conserved
General Pressure

49. v² = v0² + 2a(x-x0)
Ideal Gas Law
P=Patm + rho g h
Kinematic with Velocity - Acceleration - and Displacement
Ug= Gm1m2/r

50. Current
L=n/2?
A1V1=A2V2
I=?q/?t
Pressure from Depth