EDEXCEL GCSE PHYSICS FORMULAE YOU NEED TO KNOW FOR JUNE 17

 

MOTION & FORCES 1 - 9
ENERGY & POWER 10 - 15
ELECTRICITY & MAGNETISM 16 - 21
LIGHT & WAVES 22 - 25
DENSITY & PRESSURE 26 - 30

 

1.  average speed  =  distance  /  time                                                                    v  =  d / t

       (m / s)                    (m)           (s)

 

2.   acceleration =  change in velocity / time taken for change                             a = v – u / t

       (m / s2)                      (m / s)                          (s)

 

3.    Force       =      mass   X   acceleration                                                           F = ma

     (newton, N)   (kilogram, kg)    (metre/second squared, m/s²)

 

4.   Weight      =        mass   X   gravitational field strength                                  W = mg

      (newton, N)      (kilogram ,kg)          (newton/kilogram, N/kg)

 

 5.  momentum    =   mass  X  velocity                                                                  p = mv

        (kg m/s)             (kg)           (m/s)

 

 6.  Force  =  change in momentum  / time                                                         F  =  (mv - mu) / t

        (N)               (kg m/s)                       (s)

 

 7.   Orbital speed = 2  X  π   X  orbital radius  /  time period                            v  =  2 π r / T

          (m / s)                                   (m)                   (s)

 

  8.    moment =  Force  X  perpendicular distance between force and pivot,            moment = Fd

             (Nm)            (N)                                (m)

 

  9.   Sum of clockwise moments  =  Sum of anticlockwise moments  (for equilibrium or balanced)

..........................................................................................................................................................................

 10.   Work done = Force  X  distance moved in direction of force                       W = F x d

        (joule, J)      (newton, N)               (metre, m)

 

  11.   Power  =  work done / time taken                                                                   P = W / t

       (Watt, W)         (J)               (s)

 

  12.  change in gravitational potential energy  = weight X change in vertical height,      GPE = mgh

(joule, J)                           (newton, N)        (metre, m)

 

  13.   kinetic energy  =  ½    X   mass  X  velocity²                                                KE =  ½ mv²

           (joule, J)                (kilogram, kg)      (m/s)²

 

  14.   efficiency  =  useful energy transferred / total energy supplied,             ɛ  =  useful energy /  total energy

            (no unit)                             (J)                                       (J)

 

  15.  Total energy before event  =  Total energy after event   (conservation of energy)

   ..........................................................................................................................................................................

   16.    charge        =       current       X      time                                                         Q = It

        (coulomb, C)         (ampere, A)       (second, s)

 

   17.     Voltage    =     current       X     resistance                                                    V = IR

         (volt, V)        (ampere, A)           (ohm, Ω)

 

   18.    Power    =   voltage    X    current                                                                 P = VI

         (watt, W)         (volt, V       (ampere, A)

 

  19.   electrical energy  = voltage X current X time                                               E = I t V

                     (J)                     (V)             (A)         (s)

 

 20.   voltage across secondary coil    =    Number of turns on secondary coil  ,          Vs    =   Ns

             voltage across primary coil             Number of turns on primary coil                 Vp         Np

 

 21.   Secondary coil output power = Primary coil input power                                Vs  Is  =    Vp  Ip         

..........................................................................................................................................................................

 22.   wave velocity   =  frequency   X    wavelength                                                 v = f λ

           ( m/s)                    (hertz, Hz)          (metre, m)

 

 23.     frequency  =  1 / time period                                                                         f  = 1 / T

               (Hz)                      (s)

 

       24.  Refractive index = sine of angle of incidence / sine of angle of refraction,        n  =  sin i  / sin r

 

       25.  sine of critical angle =  1  /  refractive index                                                             sin c  =  1  /  n

  ..........................................................................................................................................................................

 26.  Density  =  mass  /  volume                                                                              ρ  =  m  / V                                      

          (kg/m3)      (kg)         (m3)

 

  27.   Pressure  =  Force / Area                                                                                 p  =  F / A

             (Pa)             (N)      (m2)

 

   28. Pressure in a liquid =  liquid density X  height of liquid  X  gravity                    p  =  ρ  h  g

                   (Pa)                           (kg / m2)             (m)                  (m / s2)

 

   29.  Boyle's Law: first pressure X first volume = second pressure X second volume,      p1 V1  =  p2 V2

                                         (Pa)               (m3)                         (Pa)                    (m3)       

 

   30. Pressure Law: first pressure / first Kelvin temperature  = second pressure / second Kelvin temperature,       p1 / T1 =  p2 / T2

                                           (Pa)                   (K)                                            (Pa)                        (K)

 

                     END OF FORMULAE SHEET.