Work done
Work done refers to the amount of work an object has done.
When a force is applied to an object, the object moves a certain amount of distance.
The force multiplied by the distance = the amount of work done
Work done= Force * Distance
(J) = N*m
Work done is measured in Nm.
1Nm = 1J
Efficiency
Most of the time, not all of the energy applied to an object is used efficiently to get the result.
Some energy is transferred into other energy types
Eg. 100J to light bulb.. only 40J are used for light energy, 60J go to thermal energy.
To calculate the efficiency..
(Total input energy / total output energy) * 100%
Total input energy
Total output energy