Science 4th, unit 6
Jan, 2014
Science 4th grade UNIT 6
LIGHT and SOUND
J. Cesar Brazo Mur
El Tomillar, J.C. Brazo
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Science 4th, unit 6
Jan, 2014
ENERGY is the ability to do work They are some common forms of energy
LIGHT
HEAT SOUND
Most energy comes from the SUN
We use energy in everything we do When you travel At home... When you study or run
El Tomillar, J.C. Brazo
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Science 4th, unit 6
Jan, 2014
We can transform energy from one form to another
Cars transform Windmills transform energy from the wind
energy from petroleum into motion
into electricity Our body transforms nutrients from food into energy to move and do diary activities
El Tomillar, J.C. Brazo
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Science 4th, unit 6
Jan, 2014
Sources of energy can be classified into... RENEWABLES Come from natural
NON-RENEWABLES
Come from resources that
resources that the
the Earth can't replace,
Earth can replace
so they are limited
Yes!
No! Sun, wind, water, biomass...
El Tomillar, J.C. Brazo
Does this energy pollute?
Petroleum, gas, coal...
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Science 4th, unit 6
Jan, 2014
TYPES of energy Solar
Comes from the
Chemical Comes from
rays of the Sun
chemical reactions
Mechanical Comes from
Thermal Comes from the motion of small particles
Electrical From electrons in motion
El Tomillar, J.C. Brazo
objects in motion
Electrons are parts of an ATOM (the smallest part of matter)
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Science 4th, unit 6
Jan, 2014
LIGHT is a type of energy that can be seen by the human eye Light is a type of ELECTROMAGNETIC RADIATION
WHITE LIGHT
PRISM
is what human eye sees, but light is really a
SPECTRUM
mixture of seven colors When white light passes through a PRISM, it divides into seven colors called SPECTRUM
El Tomillar, J.C. Brazo
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Science 4th, unit 6
Jan, 2014
PROPERTIES of light
REFLECTION Rays of light reflect in the same direction when they hit a smooth and flat surface But, when rays of light reflect on a rough surface, they reflect in different directions
El Tomillar, J.C. Brazo
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Science 4th, unit 6
Jan, 2014
PROPERTIES of light
REFRACTION When light passes through materials of different densities, the rays of light curve Glass and water have different densities. The eye sees two images
El Tomillar, J.C. Brazo
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Science 4th, unit 6
Jan, 2014
INSTRUMENTS that control and detect light telescopes
cameras magnifying glasses
binoculars
El Tomillar, J.C. Brazo
microscopes
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Science 4th, unit 6
Jan, 2014
SOUND is a form of energy that is produced when matter vibrates. When we throw a stone into the water, it produces waves... AIR
El Tomillar, J.C. Brazo
Sounds make air vibrate in waves that reach our ears
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Science 4th, unit 6
Jan, 2014
SOUND travel through solids, liquids and gases Kinds of sounds
Characteristics
Loud and quiet
INTENSITY
High and low Noises
PITCH DURATION Short / Long
TIMBRE We can distinguish different sounds
El Tomillar, J.C. Brazo
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