Forms of Energy
Potential:
Stored Energy
chemical: energy stored in chemical bonds
mechanical: e.g.. the energy stored in a    
                    tightly  wound spring
Kinetic:
Associated with moving particles or
 objects
K.E. = ½ mm2
Thermal:
The energy that a substance has by virtue of the  motion of its particles
T.E.
=
K.E.
Average kinetic Energy
=
½ m μ 2
Average speed of a large collection of particles