Energy
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Key Questions

Energy of a body is its capacity to do work.
It is measured by the total amount of work that a body can do.
SI unit of energy is Joule.
Its dimensional formula is
#[ML^2 T^(2)]# There are different forms of energy like mechanical energy, heat energy, light energy, sound energy, electric energy, magnetic energy, chemical energy, nuclear energy, etc.
It is important to note :
Mechanical energy = Kinetic energy + Potential energyOR
Mechanical energy =
#1/2 mv^2# + mgh 
Energy can not be created or destroyed . It can only be converted from one type to another.
Kinetic energy is the energy that a body possess due to its state of motion or rest. It is given by the equation
#K.E.# #=# #1/2*m*v^2# ; where#m# is the mass of the body and#v# is its velocity.Potential Energy is the energy that a body possess due to its configuration.
For gravitational potential energy its value is given by
#P.E.=m*g*h# ; where#m# is the mass of the body ,#g# is the acceleration due to gravity and#h# is the height above the ground.