protential energy

指正---係potential energy~

Start:

飛機既燃料係含有chemical energy (當燃燒既時候就會有),
燃料既chemical energy會轉做kinetic energy 黎推動飛機.

飛機飛既時候會一路飛, 要殺制先可以停.
呢個情況就係potential energy既出現~

The enrgy conversion process is:

chemical energy (energy stored in fuel)
==> heat energy (burning of fuel in the jet engine)
==> kinetic energy (running of the jet engine pushes the plane to take off)
==> potential + kinetic energy (gaining in height of the plane)

Chemical energy
is the energy stored in substances like food , fuels and the chemicals inside a dry cell . It can be changed into other forms of energy , such as haet , light , kinetic or electrical energy .

Potential energy
is a form of stored energy . An object in a stretched or compressed state may have potential energy . For example , a stretched bowstring and a compressed spring have potential energy .

Because the plane is move by burnning petrol .

Therefore , the energy changes of the plane is ...
chemical energy
to
electrical energy
to
kinetic energy