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.
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
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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