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toh yi peng

on 6 May 2010

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Transcript of ENERGY

kinetic energy
elastic potential energy
ExTrA energy an object possesses due to its MoTiOn
produce because of motion
moving air
potential energy
gravitational potential energy
wind turbine
how it works
1) use kinetic energy from the wind- generate electricity
2) wind turns turbine, generators turn too
3) electricity for households is produced
*amt of KE depends on the speed of the object
A form of energy we can hear
produced by things that are
vibrating/ moving
when an object moves= air surrounding it
sound waves
We hear sounds when sound waves that are travelling through the air or another material reach our ears
what is it?
A sound wave reflected back to its source in sufficient strength
with a sufficient time lag to be distinguished apart
Sound is reflected
again & again
from different surfaces
method of using echoes to "see"
make sounds that are
too high pitched
for us to hear
Echoes of bats' sounds bounce off objects round the bats
They listen to the echoes
find out where objects are
Helps the bats to advoid obstacles in the dark and catch insects
indirectly from
Heat energy from sun causes air to expand and rise
When warmer air rises, cooler air flows in as wind
to take the space
Electrical Energy
the presence and flow of an electric charge
a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction.
Usually generated by:
electro-mechanical generators driven by steam produced from fossil fuel combustion
the heat released from nuclear reactions
kinetic energy extracted from wind or flowing water.
used for:
working objects
Electric eel has electrical voltages in its skin
The potential energy of an elastic object (for example a bow or a catapult) that is deformed under tension or compression (or stressed in formal terminology). It arises as a consequence of a force that tries to restore the object to its original shape, which is most often the electromagnetic force between the atoms and molecules that constitute the object. If the stretch is released, the energy is transformed into kinetic energy.
Streched rubber band
Bungee Jumping
chemical energy
The potential energy associated with gravitational force.

If an object falls from one point to another inside a gravitational field, the force of gravity will do positive work on the object and the gravitational potential energy will decrease by the same amount.
generation of hydroelectricity
a form of potential energy related to the structural arrangement of atoms or molecules
Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction
Green plants transform solar energy to chemical energy through the process known as photosynthesis
Heat energy
a form of energy which transfers among particles in a substance (or system) by means of kinetic energy of those particle. In other words, under kinetic theory, the heat is transfered by particles bouncing into each other
from hotter objects to cooler objects
cause matters to expand
enables the water cycle to continue on and on
Light energy, also known as luminous energy, is the radiant energy of electromagnetic waves in the visible portion of the electromagnetic spectrum. The radiant energy in the visible region or quantity of light. It is in the form of electromagnetic waves, and since the visible region is commonly taken as extending 380–760 nanometers in wavelength, the luminous energy is contained within that region. It is equal to the time integral of the production of the luminous flux.
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