Quantities and Units

• Distance

  Metres, m
• Initial velocity


  Metres per second, ms⁻¹
• Final velocity

  Metres per second, ms⁻¹
• Time

  Seconds, s
• Acceleration

  Metres per second squared, ms⁻²
• Force


  Newton, N
• Mass


  Kilograms, kg
• Weight


  Newton, N
• Moment


  Newton metre, Nm
• Momentum


  Kilogram metres per second, kgms⁻¹
• Work done


  Joules, J
• Kinetic energy


  Joules, J
• Gravitational potential energy


  Joules, J
• Height


  Metres, m
• Power


  Watts, W
• Efficiency


  No units
• Potential difference

  Volts, V
• Charge


  Coulombs, C
• Resistance

  Ohms, Ω
• Current


  Amperes, A
• Resistivity

  Ohm metre, Ωm
• Number of charge carriers

  No units
• Density


  Kilograms per metre cubed, kgm⁻³
• Volume


  Metre cubed, m³
• Radius


  Metres, m
• Extension


  Metres, m
• Stress


  Newtons per metre squared, Nm⁻²
• Area


  Metre squared, m²
• Strain


  No units
• Length


  Metres, m
• Young modulus


  Newtons per metre squared, Nm⁻²
• Elastic potential energy


  Joules, J
• Wave speed

  Metres per second, ms⁻¹
• Frequency


  Hertz, Hz
• Wavelength

  Metres, m
• Tension


  Newton, N
• Mass per unit length


  Kilograms per metre, kgm⁻¹
• Intensity


  Watts per metre squared, Wm⁻²
• Lens power

  Dioptres, D
• Magnification


  No units