Physics
Energy
The energy of a body is its ability to do work.it is measured by the amount of work
that it can perform. the SI unit of energy is joul. There are many forms of energy ,
such as mechanical energy, heat energy, light energy, chemical and atomic energy.
Mechanical energy
Mechanical energy is the energy possessed by an object due to its motion or
position.
EMechanical energy = U+K
U=Potential energy = mgh
K = Kinetic energy = 1/2mv2
Hence
Emechanical energy=1/2mv2+mgh
Potential energy
Potential energy of a body is the energy it possesses by virtue of its position or
state of strain.
Eg: water stored up in a reservoir, a wound spring, compressed air.
