We will do a lesson on shadows blocking light on Tuesday of this week. A study guide will go home for Thursday's closed note test.
Wednesday: We wll take an open note test on light energy. We have been writing notes throughout the unit and students are only able to use the notes they took themselves.
Thursday: We will take our closed note test on light energy.
Friday: We will begin our unit on force and motion.
We are focusing on light energy this week. Students will learn these facts about light:
1. light travels in straight lines
2. light travels faster than sound
3. light can travel through space (unlike sound)
4. Light can be reflected, refracted or absorbed
5. White is a combination of all colors of light.
6. Roy G Biv is a good way to remember the color spectrum: red, orange, yellow, green, blue, indigo and violet.
7. We can see through transparent objects easily, translucent objects let light through, but we cannot see through them easily (frosted glass windows) and opaque objects do not let light through.
8. Light REFLECTS off of mirrors, water, smooth surfaces.
9. Light REFRACTS when light rays slow down as they travel through different mediums. A pencil in water looks broken because light rays slowed down as they went through the water
10. Light can be ABSORBED. The color black absorbs all light. If a shirt looks red to you it means that it absorbed all other colors and reflected the color red.
Transparent: these materials allow light to pass through them so we can see. Examples are glass, clear plastic, windows, etc.
Translucent: These materials let some light pass through but we cannot see through them clearly. Examples are frosted glass windows, glass blocks, some glass shower doors or bathroom windows.
Opaque: These materials do not allow light to pass through them. Examples are walls, doors, metal, brick, etc.
Reflection: light can bounce off some surfaces, like mirrors, or shiny surfaces. When this happens, we see the reflection. We can use reflection to see around corners with a mirror.
Refraction: when light slows down and bends. When you put a pencil in water and look at it from the side, it looks bent or broken. That is because the light rays slowed down as they entered the water, so you see the top of the pencil first and then the bottom. It appears it is not one straight line.