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100
Heat and light are both forms of energy


True or false?

TRUE
100
What instrument do we use to know how hot an object is?
The temperature
100
Thermal energy affects objects in............

Different ways or in the same way?

DIFFERENT WAYS
100
The state of an object can be ...
SOLID, LIQUID AND GAS
100
Name a natural and an artificial source of light
THE SUN (NATURAL)

A BULB (ARTIFICIAL)

200
How does thermal energy travel through objects?
THERMAL ENERGY TRAVELS FROM THE HOTTER OBJECT TO THE COLDER ONE
200
If an object transfers thermal energy easely, it means that it is a good...
CONDUCTOR
200

If an object doesn't transfer thermal energy easely, it means that it is a(n)...

INSULATOR
200
Name a material that is a good thermal conductor and another that is a thermal insulator.

CONDUCTOR: METAL.

INSULATOR. WOOD

200
Name at least three uses of light energy

From the Sun to see and produce electrical energy.

From other sources to see in the night, to watch the TV or the computer screen, to know if a machine is switched on ...

300
Name three types of thermal transference
CONDUCTION, CONVENCTION AND RADIATION.
300
Use the blackboard to paint and example of conduction, covection and radiation.
300
Name the main three changes in state that we have studied.
MELTING, EVAPORATION, EXPANSION
300
Name one example of melting and one example of evaporation
300
___________ is radiation that can see with our eyes.
LIGHT
400
What is a transparent object?
IS THE ONE THAT DOESN'T BOLCK THE LIGHT
400
What is an opaque object?
THE OBJECT THAT BLOCKS THE LIGHT COMPLETELY
400
What is a translucent object?
THE ONE THAT BLOCKS SOME LIGHT BUT LET SOME LIGHT PASSES
400
What are the basic laws of light?
REFLECTION, REFRACTION AND WITH LIGHT
400
Say an example of reflection and one of refraction.

A MIRROR (REFELCTION)

A GLASS WITH WATER AND A SPOON INSIDE IT

500
How do mirrors reflect the light?
LIGHT TRAVELS IN STRAIGHT LINES.

THIS LINES HIT THE MIRROR THAT REFLECT THEM CHANGING THEIR DIRECTION. 

500
How refraction is produced? Put an example.
REFRACTION IS PRODUCED WHEN THE LIGHT PASSES TRHOUGH A TRASNPARENT OBJECT OR SUBSTANCE.


IF THE LIGHT PASSES TRHOUGH A GLASS OF WATER THAT CONTAINS A SPOON IT SEEMS TO ME BENT BECAUSE OF REFRACTION.

500
Explain the relation between a prism and white light.
IF WE LET PASS WHITE LIGHT TRHOUGH A PRIMS WE CAN SEE THAT THE LIGHT LEAVES THE PRISM IN FORM OF DIFFERENT COLOURS (THANKS TO REFRACTION)

SO WE CAN SAY THAT WHITE LIGHT IS COMPOSED BY THE COLOURS OF THE RAINBOW.

500
How is light transformed into heat?
SOME OBJECTS ABSORB LIGHT. THIS LIGHT ENERGY MAKES THE MOLECUES OF THE OBJECT VIBRATE AND THIS VIBRATION IS TRANSFORMED IN HEAT.
500
Relate dark and light colours with heat.
DARK COLOURS ABSORB MORE LIGHT ENERGY THAN LIGHT COLOURS. AS A RESULT THEIR MOLECUES VIBRATE MORE AND THEY BECOME HOT FASTER THAN LIGHT COLOURS.