FREE ESSAY ON MECHANICAL ENERGY

MECHANICAL ENERGY

MECHANICAL ENERGY 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 high-pressure 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. This diagram shows how the jet engine
acts as energy to lift the aircraft off the surface 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 individual relies on
food for fuel which contains energy-giving 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 man-made nuclear
reactions are used to produce a form of power we know as electricity. Electricity can be
transformed 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.
Bibliography
Bibliography Discovering Energy, Frazer, Frank Trewin Copplestone Books Ltd, 1981.
Encyclopedia Britannica, Vol. 6 Encyclopedia Britannica, 1979.