The document discusses heat and light. It defines heat as thermal energy and light as a form of radiation that travels in waves. It explains that thermal energy can be transferred in three ways: radiation, conduction, and convection. It also discusses how different materials are conductors or insulators of thermal energy. Finally, it explains how thermal energy can cause changes in state, including melting, evaporation, expansion, and chemical changes. It then defines light and discusses reflection, refraction, and how white light is composed of all colors. It explains how objects can absorb light and convert it to thermal energy.

1. Heat and Light.

2.  Heat is the amount
of thermal energy an
object has.

3.  is a form of energy
that travels through
air and space in
waves.

4.  Thermal energy always travels from a hotter
object to a colder one. In 3 different forms.
Radiation
Conduction Convection

5.  Thermal energy always travels from a hotter
object to a colder one. In 3 different forms.
Radiation
Thermal energy can be
transferred by space
through electromagnetic
waves.
Conduction.
Occurs when 2
objects are in
contact and
thermal energy
transferred from
an object to the
other .
Convection.
Occurs when thermal
energy travel trough
a gas or a liquid

6.  Thermal energy always travels from a hotter
object to a colder one. In 3 different forms.
Radiation
Conduction.
Convection.

8.  CONDUCTORS AND INSULATORS.
INSULATORSCONDUCTORS.
SOME
MATERIALS ARE
GOOD
CONDUCTORS
LIKE METAL.
A PAN
OTHER DONT
TRANSFER
ENERGY
EASILY.WOOD

9.  CONDUCTORS AND INSULATORS.
INSULATORSCONDUCTORS.

10.  THERMAL ENERGY CAUSES CHANGES IN THE
STATE OF SOME MATERIALS.
MELTING
EVAPORATION
EXPANSION
CHEMICAL
CHANGES

11.  THERMAL ENERGY CAUSES CHANGES IN THE
STATE OF SOME MATERIALS.
MELTING.
WHEN A SOLID
TURNS INTO A
LIQUID.
MOLECULES
MOVE FASTER
EVAPORATION.
THERMAL
ENERGY MAKES
A LIQUID
CHANGE INTO A
GAS

12.  THERMAL ENERGY CAUSES CHANGES IN THE
STATE OF SOME MATERIALS.

13.  THERMAL ENERGY CAUSES CHANGES IN THE
STATE OF SOME MATERIALS.
EXPANSION.
THERMAL ENERGY
CAUSES THE
MOLECULES IN A
SOLID, LIQUID OR
GAS TO VIBRATE, AS A
RESULT THE
MATERIAL EXPANDS.
CHEMICAL
CHANGES.
Thermal energy can
cause chemical
changes like when we
make fairy cakes or
an omelette.

14. EXPANSION. CHEMICAL
CHANGES.

15. Light is a radiation that we can see with our
eyes. It´s made up of microscopic particles
that travel in waves.
Objects reactions to light
Transparent
It doesn´t
block light.
Opaque
It blocks the
light
completely.
Translucient
Some objects
can block
light, but
some can pass
trough the
material.

16. Objects reactions to light

17. REFLECTION
REFRACTION
OCCURS WHEN LIGHT
ENERGY BOUNCES OFF A
SURFACE AND CHANGES
DIRECTION
OCCURS WHEN LIGHT PASSES
TROUGH SOME
TRANSPARENT SUBSTANCES
LIKE WATER, AND LIGHT
ENERGY CHANGES
DIRECTION SLIGHTLY.

18. REFLECTION
REFRACTION

19. WHITE LIGHT
WHITE LIGHT IS MADE
UP OF ALL THE
COLOURS COMBINED
TOGETHER.
WE CAN DIVIDE IT BY
REFRACTION

20. WHITE LIGHT

21. When light energy hits an object,
some of this energy is absorbed by
the object.
This energy makes the molecules of
the object vibrate faster . If we touch
the object, we feel this vibration as
heat.

22. What absorbs
more heat?
MAKE A
RAINBOW.
Time to experiment.

23. Light
bulbs.
Lightni
ng
bolt.
The
Sun