seegongsik
Saved words
Grade 2 (age 7-8)

Light & Shadow

Light & Shadow

Light travels straight, like a flashlight beam. When an object blocks its path, a dark area forms behind it, and that is a shadow. The Sun is low at morning and evening so the shadow is long, and high at noon so it is short. Move the slider to change the light angle and see the shadow grow and shrink.

Why are there Shadows?
45°
💡 The Secret of Light and Shadow
①Light travels in a straight line
②When an object blocks light, dark area forms behind
③That dark area is the 'shadow'!
How Shadows Change
🌞 Sun Moves, Shadow Changes!
①Morning — sun is low, shadow is long
②Noon — sun is high, shadow is short
③Evening — sun is low again, shadow is long
④Try the slider!
Fun Properties of Light
🔦 Light Goes Straight
①Flashlight makes light go straight
②Light does not bend → shadow forms
③Make hand shapes for shadow play!
🌈 Colors Hide in Light!
①Sunlight looks white but is many colors mixed
②Rainbow after rain → light gets split
③7 colors: red, orange, yellow, green, blue, indigo, violet!
Summary
🎯 Light & Shadow Summary
①Light travels straight
②Object blocks light → shadow forms
③Low light → long shadow
④High light → short shadow
⑤Rainbow colors hide in light!
Examples and Unit Test
Example 1
Why is a shadow made? How does light travel?
1
Light travels straight ahead (in a straight line).
2
When an object blocks the light, a dark area is made behind it, and that is a shadow.
▸ Light travels straight, and when an object blocks it a shadow is made
Because light goes straight without bending, a shadow is made.
Example 2
When the Sun is low and when it is high, how does the length of the shadow change?
1
When the Sun (the light) is low, the shadow stretches out long.
2
When the Sun (the light) is high, the shadow gets short.
▸ When the light is low the shadow is long, and when it is high the shadow is short
Shadows are long in the morning and evening, and short at midday.
Unit Test
When does a shadow get the longest?
①When the light shines low
②When the light shines high
③When there is no light
④When the object is transparent
⑤When the object is small
▸ ① When the light shines low
1
When the light shines low, the shadow stretches out long.
2
When the light shines high, the shadow gets short, so shadows are shortest at midday.
← Previous
Food & Nutrition
Next →
Air & Wind