What Is Work?
We all do work… even lifting a pencil is work! It expends energy… and it changes matter. So, what really is work, from a physics point of view? Read more…
http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1a.html
http://www.edinformatics.com/math_science/work_energy_power.htm