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Energy:
The capacity to do
work is called energy. Energy is neither created nor
destroyed. It is converted from one form to another.
Energy = mc2
where
m = mass
c = speed of light
Kinetic Energy: Kinetic energy
is the energy possessed by a body by virtue of its motion.
It is generally denoted by Ek. Its S.I. unit is J and its dimension is [ML2T-2].
Hence,
Potential Energy (P.E.):
Potential energy is the energy possessed by a condition or
virtue of its position or state or configuration. It is
generally denoted by Ep. Its S.I. unit is J and
its dimension is [ML2T-2]
Hence,
Power:
The time rate at which
work is done is called power or work done per second is
called power. It is generally denoted by P. Its S.I. unit is
watt and its dimension is [ML2T-3].
Hence,
Work:
Work is said to be done only when a
force produces motion. Work done in moving a body is equal
to the force exerted on the body and the distance moved by
the body in the direction of force. It is generally
denoted by w. Its S.I. unit is J and its dimension is.
Hence, W = Force x Distance
= F. x S.
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