Teachers Notes

 

Work done has a very specific meaning in Physics. The energy transferred from one energy store to another when a force is applied on an object over a given distance is work done, in other words:

 

     E=Fd where E represents work done (Energy), F is the force and d is the distance over which the force is applied

 

Throughout Physics there are many parameters which define the rate of change of something over time (for example velocity (v) is the change of distance (d) over time (t) (d/t), acceleration (a) is the change of velocity over time ((v-u)/t), current (i) is the change of electric charge over time (Q/t) and so on). Power is defined as the rate of change of energy over time, in other words:

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     P=E/t where P is the Power (measured in Watts, W or sometimes Joules/second J/s which is a very good way to remember Power as the rate of change of energy), E represents work done (Energy) and t is the time it takes to transfer the work done (Energy)

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