Test your basic knowledge |

AP Physics B: Formulas

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. Couloms law (force between two charged objects)
Force of Spring
Centripetal Acceleration
F=kQ1Q2/r² BREAK INTO VECTORS
W=Fd=mad - direction of force must be same as direction of distance

2. Pressure (2 formulas)
P=F/A=rho(g)h
Kavg=(3/2)kbT
KE=1/2mv²
Archimedes Principle/Bouyancy

3. Magnitude of gravitational forces between objects
Force of Gravity
F=Gm1m2/r²
V=(331 +.6T) T=temp in Celsius
Momentum

4. Resistivity in a wire
Thermal Conductivity
1/2QV=U
R=rho L/A A=cross sectional area
T=2pvl/g

5. Net force/apparent weight broken done
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
V=vFt/(m/l)
Force of Spring
f=mv²/r

6. Isothermal process
Fgx=FgCos?
Temperature is constant - ?U=0 - -Q=W
clockwise
Ug= Gm1m2/r

7. A1V1 = A2V2
Continuity
Q=CV
F=Gm1m2/r²
in series - measures current - low resistance

8. Voltage-parallel plates
SG=rho object/10³
V=Ed
Sum of all currents (I) entering=sum of all currents (I) leaving
P=mv (Kg m/s) or (N s)

9. Negative torque
W=KEf-KEi
P=Patm + rho g h
clockwise
Kinematic with Velocity - Acceleration - and Displacement

10. Simple force equation
Average Molecular Kinetic Energy
T=2pvm/k
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
F=ma

11. F-NF or vice versa
?P=rho(g)?h
F=ma
q=K?AT/L
Constructive: 2t=m?+1/2? - Destructive: 2t=m?

12. Energy of gravitational attraction
Ug= Gm1m2/r
1/2QV=U
on a solenoid wrap finger around direction of current - thumb will point in north pole direction
Ft=0

13. P = Fvcos?
billiard balls - no sticking total energy is conserved
Fgx=FgCos?
V=added - Q=constant - C= 1/C
Power from Force

14. Period for circular motion
T=2pr/v
V=IR
Work
px and py are conserved

15. F(spring) = -kx
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
t=Fr - force must be perpendicular to the moment arm and the axis of rotation
Force of Spring
Flux (in webers)=Bcos?A

16. Continuity equation [Conservation of mass]
Pressure from Depth
A1V1=A2V2
SG=rho object/10³
Q=CV

17. F(gravity) = -(Gm1m2/r²)
V=Ed
Ft=0
P=F/A=rho(g)h
Force of Gravity

18. Carnot engine
SG=rho object/10³
rho=m/v
Centripetal Acceleration
Adiabatic and isothermal processes ec= TH-TL/

19. vrms (2 equations)
Fgy=FgSin?
QH=QL +W and e=W/QH
Average Speed of each Molecule
v3kT/m [mass per molecule] - v3RT/M [molar mass]

20. Critical speed is
rho=m/v
Ft=0
Fnx=FnSin?
Vab=Rated voltage-IR (r=internal resistance)

21. Simple density formula
Kinematic with Velocity - Acceleration - and Displacement
Fy=FnCos?-Fg
rho=m/v
F=kQ1Q2/r² BREAK INTO VECTORS

22. The three kinematics equations
F=Bvsin?q
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
Fx=mv²/r=FnSin?
V=(331 +.6T) T=temp in Celsius

23. K = ½mv²
1/2QV=U
Fny=FnCos?
a=v²/r
Kinetic Energy

24. Parallel Circuits
Spring Potential Energy
Kinetic Energy
Ft=0
V=constant - I=added - R=1/r added

25. U(gravitational) = -(Gm1m2/r)
F=BIL
Pin=Pout=Fin/Ain=Fout/Aout
Gravitational Potential Energy Anywhere
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS

26. v² = v0² + 2a(x-x0)
V=constant - Q=added - C=added
Fgx=FgCos?
T=2pr/v
Kinematic with Velocity - Acceleration - and Displacement

27. F(friction) = µN
Force of Friction
Fny=FnCos?
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
1ev=1.6E-19J

28. Adiabatic process
?U=W - no heat added system (Q=0)
W=KEf-KEi
F=ma
Continuity

29. Voltage-charges formula (2)
1/2QV=U
q=K?AT/L
V=W/Q=KQ/r NO VECTORS
Vab=Rated voltage-IR (r=internal resistance)

30. Engines (2 equations)
Fy=FnCos?-Fg
Kinetic Energy
P=F/A=rho(g)h
QH=QL +W and e=W/QH

31. Force on a current carrying wire in a magnetic field
F=BIL
?P=rho(g)?h
E=-N Change in flux/?t=Blv (v=velocity of the wire)
V=added - Q=constant - C= 1/C

32. Average kinetic energy
sum of voltages must be zero
Kavg=(3/2)kbT
Adiabatic and isothermal processes ec= TH-TL/
Force of Gravity

33. Capacitors in parallel
V=constant - Q=added - C=added
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
F=Bvsin?q
moment arm - perpendicular distance from the force to the axis of rotation

34. x = x0 + v0t + ½at²
PE=1/2kx²
Fnet=Fb-Fg
sum of voltages must be zero
Kinematic with Displacement - Velocity - Acceleration - and Time

35. Impulse
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
Fgx=FgCos?
Archimedes Principle/Bouyancy
J=?vm=F?t

36. Kirchhoffs Junction rule
P=Patm + rho g h
V=(331 +.6T) T=temp in Celsius
Sum of all currents (I) entering=sum of all currents (I) leaving
F=Bvsin?q

37. Thermal expansion
P=IV
F=kQ1Q2/r² BREAK INTO VECTORS
?L=(coefficient of linear expansion)aLinitial?T
P=F/A=rho(g)h

38. Voltage (circuts)
Kinematic with Velocity - Acceleration - and Displacement
V=IR
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
L=n/4? has to be odd numbers

39. p = mv
Momentum
P=F/A=rho(g)h
Force of Friction
Pin=Pout=Fin/Ain=Fout/Aout

40. F-F or NF-NF
Fny=FnCos?
F=Gm1m2/r²
Work
Constructive: 2t=m? - Destructive: 2t=m?+1/2?

41. Isovolumetric/isochoric
?v=0 - w=0 area under the curve is zero
KE=1/2mv²
Ideal Gas Law
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion

42. Standard pressure and temperature and pressure
Efficiency of a Heat Engine
V=constant - Q=added - C=added
273K and 1.013E5 pa
T=2pvm/k

43. K = (3/2)kT
F=BIL
moment arm - perpendicular distance from the force to the axis of rotation
Kinetic Energy
Average Molecular Kinetic Energy

44. Flux
Flux (in webers)=Bcos?A
General Pressure
moment arm - perpendicular distance from the force to the axis of rotation
Force of Friction

45. v = v0 + at
rho=m/v
moment arm - perpendicular distance from the force to the axis of rotation
Flux (in webers)=Bcos?A
Kinematic with Velocity - Acceleration - and Time

46. On a banked curve in circular motion - Fn in the y is
moment arm - perpendicular distance from the force to the axis of rotation
Fny=FnCos?
on a solenoid wrap finger around direction of current - thumb will point in north pole direction
Power from Force

47. On an inclined plane - gravity in the y
F=ma
Fb=mf g= rhof Vf g
moment arm - perpendicular distance from the force to the axis of rotation
Fgy=FgSin?

48. W
F=BIL
Continuity
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
P=Patm + rho g h

49. natural frequencies in a closed tube
L=n/4? has to be odd numbers
Fny=FnCos?
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
W=Fd=mad - direction of force must be same as direction of distance

50. Centripetal acceleration
a=v²/r
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
Fb=mf g= rhof Vf g
f=mv²/r