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Physical Science Part 4-LIGHT K. Delaup Abney Elementary

Physical Science Part 4-LIGHT K. Delaup Abney Elementary

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Page 1: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

Physical Science Part 4-LIGHT

K. Delaup

Abney Elementary

Page 2: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• Light is a kind of energy. • Without light energy, you could not see.

anything.

Page 3: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• Changes light energy can cause are: – it helps plants make food and grow; – it can move cars; – it makes things visible; – it can power satellites in space.

Page 4: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• The sun provides energy to Earth.

Page 5: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• The bouncing of light off an object is called a reflection.

Page 6: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• You see objects in a mirror because their light is reflected straight back at you.

Page 7: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• Light bouncing off a smooth surface gives an image you can see.

• ( Ex: mirror, shiny metal, water) • Light does not reflect off of rough surfaces.

Page 8: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• There are some objects that light goes through. That's why you can see through air , water, and glass.

Page 9: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• Light travels at different speeds in air, water, and glass.

Page 10: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• The bending of light when it moves from one kind of matter to another is called refraction.

– (EX. If you place half of a toy in a glass bowl of water so that you can see half of the toy in the water and half above water (in air), the light isn't bending. So the toy will look as if it is broken in two.)

Page 11: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• Light travels through air, water, and glass. However, most matter doesn't let light pass through.

Page 12: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• Stopping light is called absorption.

Page 13: Physical Science Part 4-LIGHT K. Delaup Abney Elementary

• There are three ways an object can interact with light. 1. opaque - the object reflects or absorbs all light (Ex. wood, door) 2. translucent - object reflects and absorbs some light

(Ex. fogged over window, wax paper) 3. Transparent - object does not reflect or absorb much light.

(Ex. windows and plastic wrap.)

Page 14: Physical Science Part 4-LIGHT K. Delaup Abney Elementary