# Shared Flashcard Set

## Details

IGCSE Physics
Equations for IGCSE Physics
32
Physics
03/27/2011

Term
 Equation for Density
Definition
 mass         Density  =  ---------                           volume   OR                   m            ρ = ------                 V
Term
 Equation for Relative Density
Definition
 density of substance Relative Density = --------------------------                           density of water
Term
 Equation for Average Speed
Definition
 distance moved average speed = ---------------------                         time taken   OR        s        V = ----      ?       t
Term
 Equation for Average Acceleration
Definition
 change in velocity average acceleration = ----------------------                                 time taken   OR        ΔV a = ----       t
Term
 In the equations of motion, what do each of these letters: s        u        v        a        t        stand for?
Definition
 s = displacement [m]       u = initial velocity [m/s]   v = final velocity [m/s]     a = acceleration [m/s2]     t = time [s]
Term
 Equation of motion which equals v = _________
Definition
 final velcity = initial velocity + (acceleration X time)   OR   v = u + at
Term
 Equation of motion which equals s = __________   (but does not include v)
Definition
 1 displacement = (initial velocity X time) + (--- X acceleration X time2)                         2   OR   s = ut + 1/2 at2
Term
 Equation of motion which equals s = __________   (but does not include a)
Definition
 1                              displacement = --- (initial velocity +final velocity) X time 2                            OR   s = 1/2 (u+v) t
Term
 Equation for motion which equals v2 = ____________
Definition
 final velocity2 = initial velocity2 + 2(acceleration X displacement)   OR   v2 = u2 + 2as
Term
 Equation for Resultant Force   or   Newton's Second Law of Motion
Definition
 resultant force = mass X acceleration   OR   F = ma
Term
 Equation for Weight
Definition
 weight = mass X gravititational feild strength   OR   W = mg
Term
 Equation for Momentum
Definition
 momentum = mass X velocity
Term
 Equation for Impulse   or   Change in Momentum
Definition
 change in momentum = resultant force X time
Term
 Equation for Moment of a force about a point
Definition
 Moment of a force  = force X perpendicular distance about a point                         from the point
Term
 Equation for Spring Constant
Definition
 Load = spring constant X extention
Term
 Equation for Pressure
Definition
 force Pressure = -------                 area   OR        F P = ---       A
Term
 Equation for Pressure In Liquids
Definition
 Pressure = density X gravitational potential energy X depth   OR   P = ρgh
Term
 Equation for Work
Definition
 Work done = force X distance moved in the direction of the force
Term
 Equation for Gravitational Potential Energy
Definition
 Gravitational potential energy = mass X gravity X distance moved   OR   PE = mgh
Term
 Equation for Kinetic Energy
Definition
 1 Kinetic Energy = (----) mass X Velocity2 2   OR   KE = (1/2) mv2
Term
 Equation for Efficiency
Definition
 useful work done Efficiency = ---------------------                energy input   OR                    useful energy output efficiency = --------------------------                  energy input   OR EVEN                    useful power output efficiency = -------------------------                  power input
Term
 Equation for Power
Definition
 work done Power = -------------            time   OR   Useful power output = force X speed
Term
 Equation for a machine's mechanical advantage
Definition
 output force Mechanical advantage = ------------------                                   input force
Term
 Equation for a machine's velocity ratio
Definition
 distance moved by input force Velocity ratio = ---------------------------------------                       distance moved by output force
Term
 How to find Kelvin temp. from Centigrade/Celsius temp.
Definition
 Kelvin Temp. = Centigrade/Celsius Temp. + 273   OR   Temp/K = Temp/C + 273
Term
 Equation for Energy Transfered
Definition
 Energy Transfered = mass X specific heat capacity X temp. change   OR   Energy transfered = mcΔT   ANOTHER EQUATION...   Energy Transfered = mass X specific latent heat   OR   Energy Transfered = mL
Term
 Equation for the speed of a wave
Definition
 speed = frequency X wavelength   OR   v = fλ
Term
 Equation for Refractive Index of a medium
Definition
 speed of light in a vacuum refractive index = ---------------------------------                          speed of light in medium   OR                            sin (angle incidence) refractive index= ---------------------------                         sin (angle refraction)
Term
 Equation for Charge
Definition
 Charge = current X time   OR   Q = It
Term
 Equation for   Potential Difference or Voltage
Definition
 Potential Difference = current X resistance   OR   V = IR
Term
 Equation for Electrical Power
Definition
 Power = Potential Difference X Current   OR   P = IV   ANOTHER EQUATION   Power = Current2 X Resistance   OR   P = I2R
Term
 Equations for finding Total Resistance when multiple resistors are in a circuit
Definition
 Series: Total Resistance = R1 + R2 + R3 etc...   Parallel:                 1       1       1 Total Resistance = ---- + ---- + ----   etc...                  R1      R2     R3
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