physics formula

• Speed (m/s) =


  Distance(m)/TIme(s)
• Velocity(m/s) =


  Displacement(m)/Time(s)
• Accleration(m/s^2) =


  Change in velocity ( m/s) / time(s)
• Weight (N) =


  Mass (kg) * GFS (N/kg)
• Density (kg/m^3) 


  Mass(Kg)/Volume(m^3)
• Force applied to spring(N) =

  Spring constant (N/m) * extension (m)
• Moment of a force ( N/m) = 


  Force (N) * Distance from pivot ( m)
• Pressure ( Pa ) = 


  Force (N) / area (m^2)
• Work done (f) =

  Force (N) * Distance ( M)
• Power ( W ) = 


  energy transferred (j) / time (s)
• Kinetic energy (j) =


  1/2 mass(Kg)*velocity(m/s)^2
• Gravitional potential energy(J) =


  Mass ( kg) * height (m ) * GFE ( N/kg)
• Effciency =

  Useful Output / Total Input
• Waves speed (m/s) = 


  Frequency (Hz) * Wavelength ( m )
• Refractive index ( Use angles )

  Sin I / Sin R
• Refractive index ( use speed ) =

  Speed of light in vacuum / Speed of light in medium
• Charge ( C )


  Current (A) * Time (s)
• Potential difference ( V ) 


  Current ( A) * resistance ( OHM )
• Electrical power ( W ) 


  Current ( A ) * Potential difference ( V )
• Energy transfered electrical ( j ) 


  Current ( a ) * Potential difference ( V ) * Resistance ( OHM )
• Total resistance in series (OHM ) 


  R1 + R2+R3....
• Total resistance in parallel ( OHM )


  1/Rt = 1/R1 + 1/R2 + 1/R3 ...
• Transformer equation ( turns and voltage )

  Vp/Vs = Np/Ns
• Transformer equation ( Current and voltages )

  Vp/Vs = Is/Ip