Science 4th, unit 6

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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