# SAT Physics Formulas

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1. Big Five #4
Missing D
Vf = Vi + At
2. Projectile Motion
Y position
Dy = Vsinθ(t) - (1/2)gt^2
3. Big Five #1
Missing Acceleration
D = (1/2)(Vf+Vi)(t)
4. Inclined Plane
Normal Force
Fn = mg*cosθ
5. Inclined Plane
Gravity Pushing Down Plane Force
Fx = mg*sinθ
6. Velocity of a Satellite
Relationship between Period and Orbital Radius
• v = sqrt(GM/R)
• T is proportional to Rsqrt(R)
• If R is increased by 4 then T is increased by 4sqrt(4)
7. Projectile Motion
X position
Dx = Vcosθ(t)
8. Big Five #5
Missing t
9. Big Five #2
Missing Vf
D = Vi(t) + (1/2)At^2
10. The Universal Gravitational Constant
G = 6.67 * 10^-11
11. Newton's Law of Force of Gravity
Fg = G(m1*m2)/r^2
12. Pulley System
Relationship of Force
In general, pulley systems multiply our force by the number of strings pulling on the object
13. Force of Friction
Ff = μmg
14. Big Five #3
Missing Vi
D = Vf(t) - (1/2)At^2
15. Projectile Motion
Y velocity at point
Vy = Vsinθ -g(t)
16. First Law of Thermodynamics
The total amount of energy in a system will remain constant; it will be conserved
17. Work
• W = Fdcosθ
• W = Fd
18. Kinetic Enegy
KE = (1/2)mv^2
19. Work-Energy Theorem
W = ΔKE
20. Potential Energy
PE = mgh
21. Mechanical Energy
• ME = PE + KE
• KE1 + PE1 = KE2 + PE2
22. Escape Velocity
Ve = sqrt(2GM/r)
23. Power
P = W/t
24. Latent Heat of Transformation
• Q = mL
• L is heat of fusion for S->L
• L is heat of vap for L->V
25. Calorie
1c = 4.18J
26. Heat
Q = mCΔT
27. Kelvin
K = C + 273
28. Volume Expansion
• ΔV = β*Vi*ΔT
• β = 3α
29. Pressure
P = F/Area
6.022 * 10^23
31. Linear Expansion
ΔL = α*Li*(ΔT)
32. Molar Mass
• M = Na * AMU
33. Ideal Gas Law
PV = nRT
34. Universal Gas Constant
R = 8.31 J/molK
35. 0th Law of Thermodynamics
If object 1 and 2 are each in thermal equilibrium with object 3, then objects 1 and 2 are in thermal equilibrium
36. Ideal Gas Energy
Root Mean Square Speed
• Kavg = (3/2)KbT
• Vrms = sqrt(3RT/M)
37. Work(Pressure)
W = PΔV
38. Efficiency
Eff = Wout/Win * 100
39. A collision is elastic if..
• The total kinetic energy is reserved
• //Not likely in real life
40. Impulse Momentum Theorem
• J = FΔt
• J = Δp
41. Linear Momentum
p = mv
42. Torque
• τ = r*F*sinθ
• τ = L * F
43. Law of Torque
• Tnet = Iα
• //I is moment of inertia
• //α is angular acceleration
44. Centripetal Acceleration
Ac = v^2/r
45. Angular Acceleration
α = Δω/Δt
46. Kepler's 1st Law
The orbit of each planet is an ellipse and the sun is at one focus
47. Kepler's 2nd Law
An imaginary line from the sun to a moving planet sweeps out equal areas in the same interval of time
48. Kepler's 3rd Law
The ratio of the square of a planet's period of revolution to the cube of its average distance from the sun is a constant that is the same for all planets. T^2/a^3
49. Angular Velocity
ω = Δθ/Δt
50. Conservation of Angular Momentum
• τnet = ΔL/Δt
• //L = mrv
51. Angular Momentum
L = rmv
52. Hooke's Law of String
Fs = kx
53. Simple Harmonic Motion
Elastic Potential Energy
Us = (1/2)kx^2
54. Simple Harmonic Motion
Period and Frequency
• f = (1/2pi)sqrt(k/m)
• T = 2pi * sqrt(m/k)
55. Period and Frequency
• T = 1/f
• f = 1/T
56. Pendulum
Frequency and Period
• f = (1/2pi)sqrt(g/L)
• T = 2pi * sqrt(L/g)
57. Electrical Field Strength Vector
E = K(Qsource/r^2)
58. Coulombs's Constant K
K = 9 * 10^9 Nm^2/C^2
59. Coulomb's Law
Fe = K(q1 * q2)/r^2
60. Elemental Charge
1.6 * 10^-19
61. Electrical Potential
V = KQ/R
62. Change in Electrical Potential Energy
• ΔV = qΔΦ
• ΔV = qV
63. Capacitance
C = Q/V
64. Electrical Resistance
Ω = ΔV/I
65. Electrical Current
I = ΔQ/Δt
66. Electrical Power
• P = IV
• P = I^2 * R
• P = V^2/R
67. To get total resistance when resistors are in a series you...
68. To get the total resistance when resistors are in parallel you...
Add the reciprocals then take the reciprocal
69. The equivalent capacitance of a collection of capacitors is found by...
70. The total capacitance of capacitors in a series is found by...
Adding reciprocals and taking the reciprocal
71. Magnetic Force on a current carrying wire
Fb = I * l *Bsinθ
72. Magnetic Force on a moving charge
Fb = |q|vBsinθ
73. Magnetic Field units
• Teslas
• 1 Gauss = 10^-4 Tesla
74. Speed of a Wave
V = fλ
75. Faraday's law of electromagnetic induction
ξ = -ΔΦ/Δt
76. Magnetic Flux
• Φ = BAcosθ
• //A is area
• //B is field strength
77. Motional Electro-Magnetic Force
ε = vBl
78. Wave Speed on Stretched String
V = sqrt(Ft(L/m))
79. Doppler Effect
Fd = fs * ((v±vd)/(v±vs))
80. Open Pipe Formula
Fn = nv/2L
81. Closed Pipe Formula
Fn = nv/4L
82. Sound
Decibels
dB = 10log(I/10^-12)
83. Sound Intensity
• I = P/A
• //P is power
• //A is usually 4pi r^2
84. Resonant Frequency of String
Fn = nv/2L

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 Author: Henri93 ID: 308652 Filename: SAT Physics Formulas Updated: 2015-09-28 16:37:16 Tags: SAT Physics Formulas Folders: SAT Description: SAT Physics Formulas Show Answers:

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