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Energy!energy2.htm;
Sources of energy!sources_of_energy2.htm;
[
Renewable!renewableenergy.htm;
[
Solar!solarenergy.htm;
Wind!windenergy.htm;
Geothermal!geothermalenergy.htm;
Biomass!biomass.htm;
hydropower!hydropower.htm;
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nonrenewable!nonrenewableenergy.htm;
[
Natural gas!naturalgas.htm;
Coal!coal.htm;
oil(Petroleum)!petroleum(oil).htm;
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Types of energy!types_of_energy2.htm;
Forms of energy!forms_of_energy2.htm;
Energy Conservation!conservation_of_energy2.htm;
Transformation of energy!transformation_of_energy3.htm;
Measurement of energy!measurement_of_energy4.htm;
Power!power1.htm;
Heat!heat1.htm;
Combustion Engine!Combustion engine1.htm;
Joule's Experiment!joule's experiment.htm;
Fun Facts!funfacts1.htm;
Transformation
of Energy
The
motion of a pendulum is a classic example of mechanical energy
conservation. A pendulum consists of a mass (known as a bob)
attached by a string to a pivot point. As the pendulum moves it
sweeps out a circular arc, moving back and forth in a periodic
fashion.
The
pendulum swings down, changing its gravitational potential
energy into kinetic energy. Then, as it swings up, the kinetic
energy changes back into the gravitational potential energy.
Since
there are no external forces doing work, the total mechanical
energy of the pendulum bob is conserved. The conservation of
mechanical energy is demonstrated in the animation below.
Observe the KE and PE bars of the bar chart; their sum is constant
Observe that the
falling motion of the bob is accompanied by an increase in
speed. As the bob loses height and PE, it gains speed and KE;
yet the total of the two forms of mechanical energy is
conserved.
Activity :
Discuss some examples of following energy transformations to
your classmates and teachers.
