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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 a banked curve in circular motion - Fn in the x is
F=BIL
on a solenoid wrap finger around direction of current - thumb will point in north pole direction
T=2pvl/g
Fnx=FnSin?

2. Velocity of sound in a strong
1ev=1.6E-19J
V=vFt/(m/l)
V=?f
Fy=FnCos?-Fg

3. P(avg) = W/?t
General Pressure
Power from Energy
Kinematic with Velocity - Acceleration - and Time
?P=rho(g)?h

4. F(buoy) = pVg
Archimedes Principle/Bouyancy
a=v²/r
Spring Potential Energy
E=-N Change in flux/?t=Blv (v=velocity of the wire)

5. Engines (2 equations)
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
QH=QL +W and e=W/QH
Fnet=Fb-Fg

6. Magnitude of gravitational forces between objects
Kavg=(3/2)kbT
Temperature is constant - ?U=0 - -Q=W
273K and 1.013E5 pa
F=Gm1m2/r²

7. Dialectrics insulating sheet between plates
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
General Pressure
C=KepA/d
Pressure is constant ?P=0 w=-P?V

8. Isothermal process
clockwise
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
I=?q/?t
Temperature is constant - ?U=0 - -Q=W

9. v = v(3RT)/M = v(3KT)/µ
Power from Energy
1/2QV=U
Efficiency of an Ideal Engine
Average Speed of each Molecule

10. Natural frequency open tube/not in a tub
L=n/2?
V=added - Q=constant - C= 1/C
q=K?AT/L
J=?vm=F?t

11. v² = v0² + 2a(x-x0)
Ideal Gas Law
Kinematic with Velocity - Acceleration - and Displacement
C=KepA/d
t=Fr - force must be perpendicular to the moment arm and the axis of rotation

12. Standard pressure and temperature and pressure
Power from Force
273K and 1.013E5 pa
clockwise
billiard balls - no sticking total energy is conserved

13. Average kinetic energy
Pressure is constant ?P=0 w=-P?V
W=KEf-KEi
Fb=mf g= rhof Vf g
Kavg=(3/2)kbT

14. Kirchhoffs Junction rule
f=mv²/r
Sum of all currents (I) entering=sum of all currents (I) leaving
E=-N Change in flux/?t=Blv (v=velocity of the wire)
Average Molecular Kinetic Energy

15. natural frequencies in a closed tube
Power from Energy
Kinetic Energy
V=Ed
L=n/4? has to be odd numbers

16. Resistivity in a wire
T=2pvm/k
?U=W - no heat added system (Q=0)
Pressure from Depth
R=rho L/A A=cross sectional area

17. Energy in a capacitor
1/2QV=U
Fgy=FgSin?
?U=W - no heat added system (Q=0)
P=mv (Kg m/s) or (N s)

18. P = F/A
General Pressure
V=constant - Q=added - C=added
F=ma
?P=rho(g)?h

19. Ideal gas laws
Fb=mf g= rhof Vf g
F=BIL
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
T=2pvm/k

20. Momentum
F=Gm1m2/r²
Flux (in webers)=Bcos?A
Ft=0
P=mv (Kg m/s) or (N s)

21. Couloms law (force between two charged objects)
?U=W - no heat added system (Q=0)
T=2pvm/k
PE=1/2kx²
F=kQ1Q2/r² BREAK INTO VECTORS

22. Potential energy
?U=Q + W - heat added= heat + work
PE=mgh
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
V=W/Q=KQ/r NO VECTORS

23. Positive torque
counterclockwise
Efficiency of an Ideal Engine
P=Patm + rho g h
L=n/2?

24. vrms (2 equations)
1ev=1.6E-19J
Fgx=FgCos?
Fb=mf g= rhof Vf g
v3kT/m [mass per molecule] - v3RT/M [molar mass]

25. x = x0 + v0t + ½at²
Kinematic with Displacement - Velocity - Acceleration - and Time
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
T=2pvm/k
Fx=mv²/r=FnSin?

26. H = (kA?T)/L
Thermal Conductivity
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
R=rho L/A A=cross sectional area
in series - measures current - low resistance

27. Period for a spring in simple harmonic motion
Kavg=(3/2)kbT
T=2pvm/k
Momentum
F=Gm1m2/r²

28. Banked curve - sum of the forces in the y
Fy=FnCos?-Fg
Efficiency of an Ideal Engine
P=mv (Kg m/s) or (N s)
Kavg=(3/2)kbT

29. P = Fvcos?
KE=1/2mv²
Temperature is constant - ?U=0 - -Q=W
Power from Force
Pin=Pout=Fin/Ain=Fout/Aout

30. Hookes law
Force of Spring
F=kx
Force of Friction
I=?q/?t

31. Velocity of a wave
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
Fnx=FnSin?
1ev=1.6E-19J
V=?f

32. Capacitors in series
General Pressure
273K and 1.013E5 pa
?L=(coefficient of linear expansion)aLinitial?T
V=added - Q=constant - C= 1/C

33. snells law
Average Molecular Kinetic Energy
P=Patm + rho g h
PE=mgh
n1sin?1=n2sin?2

34. Elastic collision
q=K?AT/L
billiard balls - no sticking total energy is conserved
in series - measures current - low resistance
V=added - I=constant - R= added

35. Critical speed is
P=Patm + rho g h
?v=0 - w=0 area under the curve is zero
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
Ft=0

36. Carnot engine
V=(331 +.6T) T=temp in Celsius
Adiabatic and isothermal processes ec= TH-TL/
E=-N Change in flux/?t=Blv (v=velocity of the wire)
Kinematic with Displacement - Velocity - Acceleration - and Time

37. 3rd right hand rule
SG=rho object/10³
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
A1V1=A2V2
Fny=FnCos?

38. Force on a charged particle in a magnetic field
F=Bvsin?q
Fgx=FgCos?
n1sin?1=n2sin?2
273K and 1.013E5 pa

39. Isobaric process
Q=CV
counterclockwise
Fgy=FgSin?
Pressure is constant ?P=0 w=-P?V

40. EMF (two formulas)
C=KepA/d
F=ma
E=-N Change in flux/?t=Blv (v=velocity of the wire)
Continuity

41. Parallel Circuits
f=mv²/r
I=?q/?t
T=2pvm/k
V=constant - I=added - R=1/r added

42. On a banked curve in circular motion - Fn in the y is
Centripetal Acceleration
Fny=FnCos?
V=vFt/(m/l)
W=KEf-KEi

43. Force on a current carrying wire in a magnetic field
V=Ed
Bernoulli Principal
Pin=Pout=Fin/Ain=Fout/Aout
F=BIL

44. Energy of gravitational attraction
General Pressure
Ug= Gm1m2/r
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
T=2pvl/g

45. 1st right hand rule
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
Power from Energy
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
n1sin?1=n2sin?2

46. Simple density formula
Pressure from Depth
rho=m/v
F=Bvsin?q
T=2pvm/k

47. torque
Fy=FnCos?-Fg
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
Work
t=Fr - force must be perpendicular to the moment arm and the axis of rotation

48. F(spring) = -kx
W=KEf-KEi
Fgy=FgSin?
Gravitational Potential Energy Anywhere
Force of Spring

49. P = P0 + pgh
Pressure from Depth
Q=CV
?U=Q + W - heat added= heat + work
?U=W - no heat added system (Q=0)

50. K = ½mv²
clockwise
T=2pvl/g
Kinetic Energy
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion