science journal: grade 4 light unit - - get a free

Science Journal:

Grade 4

Light Unit

Name: _____________________________

Natural Vs. Artificial Light

Date: ____________________________

Light that occurs in nature is natural light. Light that is created by

people, and does not occur naturally is artificial light.

Artificial Light Natural Light

In the Chart are objects of sources of light. Identify them as either Natural or

Artifical sources of light and whether they give off heat or produce no heat at

all.

Object Natural or Artificial? Gives off heat or

produces no heat?

Light bulb

Candle

Sun

Lamp

Fireflies

Flashlight

Emitting vs. Reflecting Light

Date: _______________________________

Most things do not actually emit their own light but we see them because light

bounces off them. They reflect light and some objects reflect light better than

others.

Directions: Identify whether each object is a ‘source of light’ or if it is a

‘reflection of light’. Write ‘source of light’ or ‘reflection of light’ in the box

next to each object.

Objects: Source of light or Reflection of light?:

Cat’s eyes

Moon

Laser

Stars

Sun

Forest fire

Match flame

Candle

Bicycle reflector

Light bulb

firefly

Directions: Identify each object as a light source or a reflector. Write ‘light source’ or ‘reflector’ in the box.

Human-Made Sources of Light

Date: __________________________

Different types of Human-made sources of light were designed to solve

problems within our daily lives. We use these sources of light at school,

home and in the community daily.

Directions: In the chart below, brainstorm types of lights that are

used in your school, home and community. Write or draw it down in

the source of light column and then explain the problem that that

light solved in the next column. In the last column explain how you

can conserve this light by its length of use or by using other types of

sources of light.

Source of Light Problem it solved How to conserve this

energy

Negative Effects of Exposure to Light Experiment

Date:_________________________

Purpose: Students will experiment to see the effects of sun exposure and

what it can do to human skin and eyes.

Materials: 4 Styrofoam plates, Hand full of UV beads, 3 different types

of sunscreen (SPF 15, 30 and 45).

*Instructions posted on the board*

Predict: (What do you think

is going to happen?)

Observe: (What do you see

happening during

the experiment?

Draw what is

happening if you

can.)

Explain: (What happened and

why do you think it

happened? Any

theories?)

Light Dispersion Experiment

Date:__________________________

Purpose: To show the separation of white light

Materials: Prism, screen or wall, flashlight, bristol board or heavy paper

Predict: (What do

you think is

going to

happen?)

Observe: (What do

you see

happening

during the

experiment?)

1.

2.

Explain: (What

happened

and why do

you think it

happened?

Any

theories?)

Extension: Using your knowledge from this experiment and ‘dispersion’, explain

how rainbows are formed and appear in the sky.

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

Colour Wheels Experiment

Date: ___________________________

Purpose: To reinforce the concept that white light is made of colours.

Materials: 7 crayons: red, orange, yellow, green, blue, indigo (blue plus

purple), and violet (purple); scissors; 24” of strong, thin string;

sharpened pencil

Predict: (What do you

think is going to

happen?)

Observe: (What do you

see happening

during the

experiment?

Draw what is

happening if

you can.)

Explain: (What happened

and why do you

think it

happened? Any

theories?)

Spinning White Light

Materials: 7 crayons: red, orange, yellow, green, blue, indigo (blue plus purple), and violet

(purple); scissors; 24” of strong, thin string; sharpened pencil

Steps:

1. Colour each section of the wheel using the colours shown.

2. Cut out the wheel. Using a pencil, carefully poke two small holes in the center of the

wheel as shown (Figure 1).

3. Thread the string through the holes and tie the ends together. Center the circle on the

string (Figure 2).

4. Follow your teacher’s directions to make the spinner spin properly (Figure 3).

Light Interaction with Objects Experiment

Date: __________________________

Purpose: To observe the effect of a light on different types of materials.

Materials: Clear glass or transparent plastic wrap; waxed paper;

cardboard, flashlight

Transparent Object-Clear Glass or plastic wrap

Prediction:

Observations:

Diagram of observation:

Explanation: My definition of Transparent from observation is...

Translucent Object- Waxed paper

Prediction:

Observation:

Diagram of Observation:

Explanation: My definition of Translucent from observation is...

Opaque Object- Cardboard

Prediction:

Observations:

Diagram of Observations:

Explanation: My definition of Opaque from observation is...

Transparent, Translucent and Opaque Classification

Date: ____________________________

Purpose: To reinforce the concepts of transparent, translucent and

Opaque objects.

Materials: flashlights; writing paper; newspaper; plastic wrap; tin can;

plain glass edged with tape; frosted glass edged with tape; magnifying

glass; sunglasses; latex glove; construction paper; tissue paper;

aluminum foil; white plastic lid; a leaf, etc.

Classify each object as transparent, translucent, or opaque

Transparent

(can see through

clearly)

Translucent

(can see through but

not clearly)

Opaque

(cannot see through at

all)

Changes is Shadows Experiment

Date: __________________________

Purpose: To show the changes in a shadow’s shape, size and location.

Materials: Flashlight; puppet

Predict: (What do you think is

going to happen?)


happening during the

experiment? Draw a

picture for each

situation.)

1. When the puppet is in the middle of light source

2. When puppet is on the left of light source

3. When puppet is on the right of light source

4. When puppet is closer to the light source

5. When puppet is farther from the light source

Explain: (What happened and

why do you think it

happened? Any

theories?)

Extension: Using your knowledge from this experiment with shadows,

draw where the shadow of the house would be at each time of the day.

The Path of Light Experiment

Date: _________________________

Purpose: To show how light travels.

Materials: two pieces of bristol board; flashlight; modeling clay;

scissors; mirrors


think is going to

happen?)


happening during

the experiment?

Draw a picture

for each

situation.)

1. Path of light with bristol boards

2. Path of light when shone into a mirror


and why do you

think it

happened? Any

theories?)

Reflective Properties of Different Shapes and Textures Experiment

Date: _________________________

Purpose: To observe the reflective properties of different shapes and

textures.

Materials: Flashlight; mirror; flat foil; crumpled foil; white paper;

coloured paper; spoon


think is going to

happen?)

Observe: (What do you

see happening

during the

experiment?

Draw a picture

for each

situation.)

1. Mirror

2. Flat foil

3. Crumpled foil

4. White paper

5. Coloured paper

6. spoon


and why do you

think it

happened? Any

theories?)

Refractive properties of materials and shapes Experiment

Date: __________________________

Purpose: To observe the refractive properties of materials and shapes

Materials: Drinking glass; ruler; pencil; prism; flashlight; sheet with

print on it; jar; water pitcher (or anything that holds enough water);

water dropper; overhead transparency; water


is going to

happen?)

Station #1:


happening during

the experiment?

Draw a picture for

each situation.)


is going to

happen?)

Station #2:


happening during

the experiment?

Draw a picture for

each situation.)


is going to

happen?)

Station #3:


happening during

the experiment?

Draw a picture for

each situation.)


is going to

happen?)

Station #4:


happening during

the experiment?

Draw a picture for

each situation.)


and why do you

think it happened?

Any theories?)

Extension: Using your knowledge from this experiment on refraction, is

there any optical devices that we use today that uses these properties of

refraction?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Light and Optical Devices

Date: _____________________________

Purpose: To examine and compare how light interacts with different

optical devices.

Materials: Kaleidoscopes; reading glasses; periscopes; magnifying

glasses


think is going to

happen?)

Object: Observations:

Kaleidoscopes

Reading

glasses

Periscopes

Magnifying

glasses


and why do you

think it happened?

Any theories?)

What property of light was used in each of the optical devices?

1. Kaleidoscopes:

2. Reading glasses:

3. Periscopes:

4. Magnifying glasses:

Creating Optical Devices

Date: ____________________________

Purpose: To create your own optical device that performs a specific

function.

Materials:

The Optical device that I created was: ___________________________

My Drawing of my optical device:

The function that this optical device performs is...

_________________________________________________________

__________________________________________________________

_________________________________________________________.

The property of light that it uses is...

__________________________________________________________

__________________________________________________________.

science journal: grade 4 light unit - - get a free

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