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" MECHANICAL ENERGYă
    

 Have you ever wondered how a jet aircraft lifts its
tremendous weight off the ground, or what gives a runner the
stamina to reach the finish line in a race?  In order to answer
all these questions we must talk about the transformation of one
sort of energy into another.

 The jet aircraft gets its power from jet turbines.  These
powerful jet engines create a highpressure stream of very hot
gases that push the aircraft forward as they leave the engine. 
This is an example of heat being transformed into movement.  This
is sometimes described as Mechanical Energy.  However, this
transformation could not take place without the fuel that the
aircraft gets within its wings or fuselage.  Fuel is considered a
chemical energy.
    



  D     X  X`	`	  X  X  Xhh#  X(  X-  Xpp2  X7  X  < This diagram shows how
the jet engine acts as
energy to lift the
aircraft off the surface
  D   @ of earth.(# 






    
 Fuel can take the form of gases, solids or liquids.  When
fuels combine with oxygen from the air, they release their stored
energy as heat.  We recognize this process as burning.  The   )        0*0*0*  individual relies on food for fuel which contains energygiving
substances that our bodies can store until we need this energy to
use our muscles.  When we do use our muscles within us, we may not
always be sure that heat is given off.  Our bodies do not burst
into flames but the perspiration on our skin is a clue to what is
happening.  

 The movement of the windsurfer has a different explanation. 
The windsurfer is propelled along by a sail which collects
mechanical energy from the winds that sweep along the water.  This
energy has been produced by the sun which warms the earth's surface
and sets the air above in motion.  The sun's heat comes to the
earth as a form of radiant energy.  When the heat reaches the
surface of the earth, it causes the land or seas to rise in
temperature.

 The sun is very hot.  Infact, the center of the sun can reach
temperatures of up to 27 million degrees Fahrenheit.  This is
because of another kind of energy reaction where new substances are
continually being created as others are being destroyed.  This
reaction is known to us as the Nuclear Reaction.  Today we are
trying to imitate this reaction in improving our energy supply. 
Scientists have calculated that the sun has enough fuel to go on
producing energy at its present rate for about five billion years.

 On earth manmade nuclear reactions are used to produce a form
of power we know as electricity.  Electricity can be transformed   (        0*0*0*  into other kinds of energy such as heat, light and radio waves. 
Humans have also used the idea of nuclear reactions as a type of
weapon.  We call this powerful weapon the Atomic Bomb.  Electrical
energy can also be used to produce laser beams.  This involves
energy being concentrated to a specific narrow point where the
impact of so much power creates heat able to cut through metals.

   
         0*0*0*      



   ?   L$ 	Bibliography





   ?  	 Discovering Energy, Frazer, Frank 

 `	`	 Trewin Copplestone Books Ltd, 1981.



 Encyclopedia Britannica, Vol. 6

 `	`	 Encyclopedia Britannica, 1979.
