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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. Simple force equation
P=mv (Kg m/s) or (N s)
moment arm - perpendicular distance from the force to the axis of rotation
F=ma
counterclockwise

2. On an inclined plane - gravity in the y
Period in General
F=Gm1m2/r²
Fgy=FgSin?
Adiabatic and isothermal processes ec= TH-TL/

3. Couloms law (force between two charged objects)
General Pressure
Archimedes Principle/Bouyancy
F=kQ1Q2/r² BREAK INTO VECTORS
QH=QL +W and e=W/QH

4. Velocity of a wave
sum of voltages must be zero
V=?f
in series - measures current - low resistance
Gravitational Potential Energy Anywhere

5. Elastic collision
?U=W - no heat added system (Q=0)
V=IR
Kinematic with Displacement - Velocity - Acceleration - and Time
billiard balls - no sticking total energy is conserved

6. W = F?rcos?
V=(331 +.6T) T=temp in Celsius
n1sin?1=n2sin?2
Work
?v=0 - w=0 area under the curve is zero

7. H = (kA?T)/L
Kinematic with Velocity - Acceleration - and Time
Archimedes Principle/Bouyancy
Thermal Conductivity
q=K?AT/L

8. Banked curve - sum of the forces in the y
n1sin?1=n2sin90
Thermal Conductivity
V=vFt/(m/l)
Fy=FnCos?-Fg

9. Force buoyancy (2 formulas)
F=ma
Fb=mf g= rhof Vf g
Centripetal Acceleration
sum of voltages must be zero

10. Voltage across a battery terminal
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
Vab=Rated voltage-IR (r=internal resistance)
Centripetal Acceleration
C=KepA/d

11. Basic thermo equation
?U=Q + W - heat added= heat + work
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
Fy=FnCos?-Fg
?U=W - no heat added system (Q=0)

12. Magnitude of gravitational forces between objects
Kinematic with Velocity - Acceleration - and Displacement
F=Gm1m2/r²
V=(331 +.6T) T=temp in Celsius
Power from Energy

13. Force on a current carrying wire in a magnetic field
W=KEf-KEi
F=BIL
Pressure is constant ?P=0 w=-P?V
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS

14. Bernoulli's Equation [Conservation of energy]
Q=CV
Continuity
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
Pin=Pout=Fin/Ain=Fout/Aout

15. Simple harmonic motion - spring
P=Patm + rho g h
T=2pvm/k
V=(331 +.6T) T=temp in Celsius
Power from Energy

16. A1V1 = A2V2
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
V=IR
Continuity
1/2QV=U

17. Centripetal acceleration
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
sum of voltages must be zero
a=v²/r
rho=m/v

18. K = (3/2)kT
Average Molecular Kinetic Energy
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Period in General
P=Patm + rho g h

19. F(gravity) = -(Gm1m2/r²)
Force of Gravity
E=-N Change in flux/?t=Blv (v=velocity of the wire)
Kavg=(3/2)kbT
clockwise

20. Parallel Circuits
V=constant - I=added - R=1/r added
Sum of all currents (I) entering=sum of all currents (I) leaving
Fx=mv²/r=FnSin?
I=?q/?t

21. P(avg) = W/?t
Kinetic Energy
Power from Energy
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
L=n/2?

22. Absolute pressure
P=Patm + rho g h
Flux (in webers)=Bcos?A
Ft=0
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh

23. Flux
Average Molecular Kinetic Energy
L=n/4? has to be odd numbers
V=?f
Flux (in webers)=Bcos?A

24. Current
Fgy=FgSin?
Fnx=FnSin?
I=?q/?t
Constructive: 2t=m? - Destructive: 2t=m?+1/2?

25. Critical speed is
F=ma
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
Ft=0
Pressure is constant ?P=0 w=-P?V

26. v² = v0² + 2a(x-x0)
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
?v=0 - w=0 area under the curve is zero
Kinematic with Velocity - Acceleration - and Displacement
sum of voltages must be zero

27. Momentum
Fnx=FnSin?
P=mv (Kg m/s) or (N s)
Gravitational Potential Energy Anywhere
Sum of all currents (I) entering=sum of all currents (I) leaving

28. P = Fvcos?
Ug= Gm1m2/r
Power from Force
Work
Fb=mf g= rhof Vf g

29. F-NF or vice versa
added in parallel - measures volts - high resistance
a=v²/r
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
Work

30. F-F or NF-NF
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
Adiabatic and isothermal processes ec= TH-TL/
Period in General
n1sin?1=n2sin90

31. Period for circular motion
Flux (in webers)=Bcos?A
V=constant - Q=added - C=added
Kinetic Energy
T=2pr/v

32. On a banked curve in circular motion - Fn in the x is
PE=1/2kx²
Fnx=FnSin?
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
Period in General

33. Net work
E=-N Change in flux/?t=Blv (v=velocity of the wire)
W=KEf-KEi
Fgy=FgSin?
Force of Gravity

34. Work - simple formula
Pressure from Depth
W=Fd=mad - direction of force must be same as direction of distance
P=IV
1ev=1.6E-19J

35. Potential energy
n1sin?1=n2sin90
Force of Spring
in series - measures current - low resistance
PE=mgh

36. natural frequencies in a closed tube
Ft=0
Temperature is constant - ?U=0 - -Q=W
rho=m/v
L=n/4? has to be odd numbers

37. Ammeter
Fny=FnCos?
in series - measures current - low resistance
P=mv (Kg m/s) or (N s)
Constructive: 2t=m? - Destructive: 2t=m?+1/2?

38. K = ½mv²
Pressure from Depth
Kinetic Energy
F=Bvsin?q
Archimedes Principle/Bouyancy

39. Resistivity in a wire
273K and 1.013E5 pa
KE=1/2mv²
Centripetal Acceleration
R=rho L/A A=cross sectional area

40. Electron volts
Force of Gravity
1ev=1.6E-19J
P=W/T=FD/T=FV
Centripetal Acceleration

41. vrms (2 equations)
clockwise
v3kT/m [mass per molecule] - v3RT/M [molar mass]
n1sin?1=n2sin?2
added in parallel - measures volts - high resistance

42. Total internal reflection
V=W/Q=KQ/r NO VECTORS
?L=(coefficient of linear expansion)aLinitial?T
n1sin?1=n2sin90
?P=rho(g)?h

43. F(friction) = µN
added in parallel - measures volts - high resistance
Force of Friction
?v=0 - w=0 area under the curve is zero
F=Bvsin?q

44. Positive torque
V=vFt/(m/l)
Average Speed of each Molecule
counterclockwise
?U=W - no heat added system (Q=0)

45. Net force/apparent weight broken done
P=F/A=rho(g)h
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
T=2pvm/k
Pressure is constant ?P=0 w=-P?V

46. Ideal gas laws
Momentum
Sum of all currents (I) entering=sum of all currents (I) leaving
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
?P=rho(g)?h

47. Isobaric process
Pressure is constant ?P=0 w=-P?V
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
V=?f
T=2pvl/g

48. Kirchhoffs Junction rule
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
KE=1/2mv²
Sum of all currents (I) entering=sum of all currents (I) leaving
T=2pvl/g

49. Banked curve - sum of the forces in the x
T=2pvm/k
F=Gm1m2/r²
Fnx=FnSin?
Fx=mv²/r=FnSin?

50. T = 1/f
T=2pvm/k
V=IR
Period in General
W=KEf-KEi