Equations

• speed


  speed = distance/time
• weight


  weight = mass x gravitational field strength
• orbital speed


  orbital speed = 2π x orbital radius/time period
• density


  density = mass/volume
• pressure


  pressure = force/area
• pressure difference


  pressure difference = height x density x gravitational field strength
• voltage


  voltage = current x resistance
• charge


  charge = current x time
• energy transferred


  energy transferred = charge x voltage
• efficiency


  efficiency = useful energy output/total energy output x 100
• work done


  work done = force x distance moved
• gravitational potential energy


  gravitational potential energy = mass x gravitational field strength x height
• kinetic energy


  kinetic energy = 1/2 x mass x speed2
• power


  power = work done/time taken
• wave speed


  wave speed = frequency x wavelength
• frequency


  frequency = 1/time taken