2. FORMS OF ENERGYFORMS OF ENERGY
Light energy Can be natural or artificial. It
travels 300000 kilometers per second.
It´s made up ofseven different colours.
It iluminate objects and allows us to see
shapes, colours and sizes.
It always travels in straight lines, when that
happens , light can be absorbed, reflected or
refracted, depending of what kind or surface
ir hits. When light hits an opaque object,When light hits an opaque object,
are absorbed and others are reflected.are absorbed and others are reflected.
The colour we see is the colour that theThe colour we see is the colour that the
object reflects.object reflects.
3. Chermical energy It is released when a
chermical reaction occurs. Chermical energy
sometimes are transformed into kinetic energy.
Batteries and food are sources of chermical
energy too.
Sound energySound energy It is a vibration and can be
travel in any direction from the source. Vibrating
objects transmit this vibrationgs into air. The
vibrations move through the air until they reach
our ear. We perceive large vibrationsas loud
sounds and small vibrations as soft sounds.
Sound can travel very quickly, as fast as light.
Sound can travel througt gases, liquids and
solids, even if they are opaque. Sound can´t
travel througt a vacuum because in vacuume
there vare no particles to vibrate.
4. Kinetic energyKinetic energy all moving things have
kinetic energy. This energy is produced
through motion or movement.
Electrical energyElectrical energy it is used to power
machines, can tranformed it into light,
sound, heat and movement. It can come
from burning fossil fuels, sunlight, wind,
water and biomass. It is also produced in
nuclear power stations.
Thermal energyThermal energy Flows from a warm
substances to a cooler substances.
Sources: The sun and fossil fuels (like
coal, oil and gas)
5. ENERGY SOURCES:ENERGY SOURCES:
Renewable:Renewable:
Water: It does not pollute
Solar: t does not pollute, but solar panels can only be used in
sunny climates.
Wind: Damage habitats and kill birds.
Biomass: Organic materials from living things such as wood.
Geothermal: Heat produced by the decomposition of underground
radioactive objects.
No-renewable:No-renewable:
Fossil Fuels: Coal, oil and natural gas
Uranium: Nuclear power stations use a radioactive metal, called
uranium to generate electricity.
6. ELECTRICITY:ELECTRICITY:
All objects contain electrical charges whith can be positive or negative
If an object contain more positive charges than negative charges, it have
a positive charge
If an object contain more negative charges than positive charges, it have
a negative charge.
Objects with the opposite electrical charge atract.
Objects with the same electrical charge repel
Tipes:
Current electricity: When an electrical charge moves in an electrical
conductors, we have current electricity.
Static energy: It does not flow.
Examples a lightning, hair sticking up.
We can produce it when we rub two non metal objects together.
Magnetism:
A magnet is an object whit can attract certain metals.
Magnetism:Magnetism: Is the habilty to attract metals.
All magnets have two poles, at the end of the poles attract metal objects
7. ELECTRICITY:ELECTRICITY:
All objects contain electrical charges whith can be positive or negative
If an object contain more positive charges than negative charges, it have
a positive charge
If an object contain more negative charges than positive charges, it have
a negative charge.
Objects with the opposite electrical charge atract.
Objects with the same electrical charge repel
Tipes:
Current electricity: When an electrical charge moves in an electrical
conductors, we have current electricity.
Static energy: It does not flow.
Examples a lightning, hair sticking up.
We can produce it when we rub two non metal objects together.
Magnetism:
A magnet is an object whit can attract certain metals.
Magnetism:Magnetism: Is the habilty to attract metals.
All magnets have two poles, at the end of the poles attract metal objects
