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SAT Subject Test - Physics Formulas
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Gravity
Key Concepts:
Terms in this set (59)
v = ∆x/∆t
Kinematics - the definition of average velocity
v = (vi + vf)/2
Kinematics - definition of the average velocity, which works when acceleration is constant
a = ∆v/∆t
Kinematics - definition of acceleration
∆x = (vi)(∆t) + (1/2)(a)(∆t)²
kinematics - use this formula when you don't have final velocity
∆x = (vf)(∆t) - (1/2)(a)(∆t)²
kinematics - use this formula when you don't have initial velocity
vf² = vi² + 2(a)(∆x)
kinematics - use this formula when you don't have time
F = ma
dynamics - Newton's Second Law
f = µN
dynamics - "Physics is Fun"; friction equation
p = mv
dynamics - definition of momentum
∆p = F∆t
dynamics - impulse equation
W = Fdcosθ
Work, Energy, and Power - work equation
W = Fd
Work, Energy, and Power - work equation when component of force is in the direction that the object is moved
KE = (1/2)mv²
Work, Energy, and Power - definition of kinetic energy
PE = mgh
Work, Energy, and Power - definition of potential energy
W = ∆(KE)
Work, Energy, and Power - "work-energy" theorem
E = KE + PE
Work, Energy, and Power - definition of total energy
P = W/∆t
Work, Energy, and Power - definition of power
a = v²/r
Circular Motion - definition of centripetal acceleration
F = mv²/r
Circular Motion - definition of centripetal force
v = 2πr/T
Circular Motion - formula gives the average velocity of an object moving once around a circle in a period
ƒ = 1/T
Circular Motion - the frequency, or the number of times per second that an object moves around a circle
τ = rFsinθ
Torques and Angular Momentum - torque equation
τ = rF
Torques and Angular Momentum - torque equation when component of force is perpendicular to the lever arm
L = mvr
Torques and Angular Momentum - angular momentum (conserved)
F = -kx
springs - Hooke's Law, or spring force
PE = (1/2)kx²
springs - potential energy stored in a spring when it is either stretched or compressed
T = 2π√(m/k)
simple harmonic motion - period of the simple harmonic motion of a mass attached to an ideal spring
T = 2π√(l/g)
simple harmonic motion - period of the simple harmonic motion of a mass on an ideal pendulum
F = Gm₁m₂/r²
gravity - Newton's Law of Gravitation, or gives the attractive force between two masses
F = kq₁q₂/r²
electric fields and forces - Coulomb's Law, or gives the force of attraction or repulsion between two charges
F = qE
electric fields and forces - electric force of a charge when placed in an electric field
E = kq/r²
electric fields and forces - gives the electric field due to a charge at a distance from the charge
U = kq₁q₂/r
electric fields and forces - gives the electric potential energy for two charges
∆V = -W/q = ∆U/q
electric fields and forces - the potential difference between two points as related to work and potential energy
V = kq/r
electric fields and forces - gives the electric potential due to a charge at a distance from the charge
E = V/d
electric fields and forces - electric field for a parallel plate capacitor
V = IR
circuits - Ohm's Law
P = IV
Circuits - power formula
P = V²/R
P = I²R
Circuits - power formulas after being combined with Ohm's Law
R = R₁ + R₂ +...
Circuits - total resistance in series
1/R = 1/R₁ + 1/R₂ +...
Circuits - total resistance in parallel
q = CV
circuits - Ohm's Law for capacitors
F = ILBsinθ
Magnetic fields and forces - gives the force on a wire carrying current while immersed in a magnetic field
F = qvBsinθ
Magnetic fields and forces - force on a charge as it travels with velocity through a magnetic field
v = λf
Waves and optics - relates the wavelength and the frequency of a wave to its speed
v = c/n
waves and optics - gives the speed of light in a medium that has an index of refraction
n₁sinθ₁ = n₂sinθ₂
waves and optics - "Snell's Law", or when light moves form one medium to another with a different index of refraction
1/d₀ + 1/di = 1/f
waves and optics - works for lenses and mirrors, and relates the focal length, object distance, and image distance
m = -di/d₀
waves and optics - magnification is how much bigger or smaller the image is compared to the object
Q = mc∆T
Heat and thermodynamics - heat capacity in a system
Q = ml
Heat and thermodynamics - heat of a phase change
∆U = Q-W
Heat and thermodynamics - first law of thermodynamics
E = W/Q x 100
Heat and thermodynamics - gives the quality ("efficiency") of the engine
P = F/A
Pressure and gases - definition of pressure
PV/T = constant
Pressure and gases - Ideal Gas Law
E = hf
Modern Physics and Relativity - energy of a photon
KE = hf - Φ
Modern Physics and Relativity - photoelectric effect formula
λ = h/p
Modern Physics and Relativity - wave particle duality formula
γ = 1/√1-(v/c)²
Modern Physics and Relativity - relativistic factor
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