Science Journal: Grade 4 Light Unit

[Pages:22]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: 1.

2.

(What do

you see

happening

during the

experiment?)

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.

__________________________________________________________________

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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?)

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