equations

• Weight


  Mass x gravitational field strength

  
• Work done

  Force x distance

  
• Force applied to a spring

  Spring constant x extension
• Moment of a force

  Force x distance

  
• Pressure

  Force normal to a surface / area of that surface

  
• Distance travelled

  Speed x time
• Acceleration

  Change in velocity / time taken

  
• Resultant force

  Mass x acceleration

  
• Momentum

  Mass x velocity

  
• Kinetic energy

  0.5 x mass x (speed)^

  
• Gravitational potential energy

  Mass x gravitational field strength x height
• Power (energy)

  Energy transferred /time

  
• Power (work done)


  Work done /time

  
• Efficiency (energy)

  
• Efficiency (power)

  Useful power output / total power input
• Wave speed

  Frequency x wavelength

  
• Charge flow


  Current x time
• Potential difference

  Current x resistance
• Power (potential difference)

  Potential difference x current

  
• Power (current)


  (Current)^ x resistance

  
• Energy transferred (power)

  Power x time
• Energy transferred (charge flow)

  Charge flow x potential difference
• Density

  Mass / volume