Cloned from: MCAT PHYSICS

by rigel


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Motion Equations
x=x°+v°t+1/2at2
v= v°2 +2ax /n
v= v°+at v°sinΘ=√2gh
Force
F=ma
Universal Gravitational Law
F=Gm1m2/r2
Force on inclined plane
F=mgsinΘ
Normal Force
Fn=mgsinΘ
Centripedal Accelaration
ac=v2/r
Centripedal Force
Fc=mv2/r
Equlibrium
Fup=Fdown
Non-equilibrium
Fup=Fdown+/-ma(on weaker side add)
Torque
t=Fl
Kinetic energy
KE = 1/2mv2
Gravitational Potential Energy
Ug=mgh
Elastic potential Energy
EPE = 1/2kΔx2
Work
W=FdcosΘ
Work
W = ΔK+ΔU+ΔEi
Power
P=ΔE/t
Power
P=FvcosΘ
Coefficent of Friction
μ = F/N

μ = force of friction x forve normal to surface
Velocity
v = d/t
Acceleration
a = (vf - vi)/t
Pendulum
T = 2∏√(L/g)
Wave formula
v = f x λ
Snell's Law
n1sinΘ1 = n2sinΘ2
Newton's First Law
an object remains at rest until a force acts upon it
Newtons' Second Law
F = ma
Newton's Third Law
For every action, there is an equal and opposite reaction
Electric Field
  • Equation
  • Units
  • E = kq1/r2
  • Newtons/Coulomb or Volts/meter
Force on a charge in an electric field
F = Eq
Potential energy of a
  • charge in an electric field
  • dipole with dipole moment p=qd
  • U = Fd = Eqd
  • U = -pEcosθ
Voltage
  • definition
  • units
  • Equation
  • Potential for work by an electric field in moving an electric charge
  • Volts, or J/C
  • for point charge, V = kq1/r (NOT OVER r2 !!)
Resistance of a homogeneous conductor with resistivity ρ
  • R = ρL/A
  • resistance increases with increasing length, and decreases with cross sectional area
  • Ohm's Law
  • Electrical Power
  • Voltage = Current * Resistance (V=IR)
  • P = IV = I2R = V2/R
Kirchoff's Rules
  1. The amount of current flowing into a node must be the amount flowing out
  2. The voltage around any path must sum to zero
Capacitance
  • definition
  • parallel plate capacitor
  • capacitance C of parallel plate cap
  • Ability to store charge per unit voltage (C=Q/V)
  • separated charges create electric field E=(1/K)(Q/Aε0) where K is dielectric constant, A is area, and ε0 is the permittivity of free space, related to coulombs constant k=1/4πε0
  • so C = KAε0/d where d=distance between plates
RMS definition
Root Mean Square = square all terms, take mean, then take square root of that. multiply rms values by 1.4 (√2) to find max values
Electromagnetism
  • charge flowing + to - in a wire makes magnetic field going which way?
  • magnetic field strength dropps off according to what power law?
  • induced force F on a charge q through magnetic field B
  • right hand rule
  • inverse square
  • F=qvBsinθ where theta is angle between magnetic field and velocity of charge. Substitute qv for iL (current * Length) for current carrying wire. FORCE IS DIRECTED PERPENDICULARLY TO BOTH VELOCITY (so does no work) AND MAGNETIC FIELD ACCORDING TO RIGHT HAND RULE. radius of curvature of particle can e found by setting this equation to mv2/r
  • Faraday's Law of Induction
  • Lenz's law
  • change in flux will induce an EMF (voltage difference)
  • this induced current will make a magnetic field opposing the original one
electron-volt
kinetic energy gained by one electron accelerated through a potential difference of one volt. 1 eV = 1.6e-19 coulomb*volts = 1.6e-19 joules
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