• # Revision:Formulae for Nuffield Physics

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 Formula Alternative Unit pressure = force/area Pa or Nm-2 speed = distance/(time taken) m s-1 Work done = Force distance moved in the direction of the force J Power = energy transformed/(time taken) W or Js-1 Electrical energy = Power time Electrical energy in kWh = Power in kW time in hours J or kWh electrical energy = potential difference current time J - moment of a force about a pivot = force perp distance from force to pivot Nm - sum of clockwise moments = sum of anticlockwise moments Nm acceleration = change in velocity/change in time ms-2 Force = mass acceleration (constant mass) N wave speed = frequency wavelength ms-1 Charge = current time (constant current) C potential difference = current resistance V electric power = current potential difference W or Js-1 weight = mass gravitational field strength N kinetic energy = ½ mass velocity2 J increase in gravitational potential energy = mass g change in height (Dh small enough that g is constant) J momentum = mass velocity kg m s-1 centripetal force = mass velocity2/radius N potential difference = energy transformed/charge transferred V Resistance of element = potential difference across element/current ohms resistance = resistivity length/area ohms capacitance = charge/potential difference F Ideal gas law J mol-1 electric force (radial) N electric field strength for uniform field V m-1 electric field strength for radial field V m-1 electric potential at a point V gravitational force N gravitational field strength radial N kg-1 gravitational potential at a point J kg-1