YEAR 9 NEW GCSE PHYSICS FORMULAE SUMMER 2017

 

 

1.     Force  =  spring constant  X  extension                                                             F = ke

        (N)               (N / m)                   (m)

 

2.    Elastic potential energy  =    X  spring constant  X  extension squared          E = k e2 

                     (J)                                          (N / m)                     (m2)

 

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

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

 

4.  frequency  =  1 / Time Period                                                                             f = 1 / T

         (Hz)                       (s)

 

5.  Heat energy supplied  =  mass X specific heat capacity X temperature rise    ΔQ = m c (Ɵ2  Ɵ1)

                 (J)                          (kg)          (J /  kg oC)                        (oC)

 

6.  Heat energy = mass X specific latent heat                                                           Q = mL

              (J)             (kg)             (J / kg)

 

7.  efficiency  =  useful output energy / total input energy,           ɛ  =  useful energy /  total energy

      (no unit)                    (J)                             (J)

 

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

 

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

       (m / s)                    (m)           (s)

 

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