1. Light

2. WALT: the main properties of light
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WALT: the main properties of light

3. 16/11/2018
Sources of light
Objects that create light are “sources” of light or “luminous sources”.
Name 2 luminous sources
We can see non-luminous objects because light bounces off them and enters our eyes.
Name 2 non-luminous sources

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How does light travel?

5. Light travels in straight lines:
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Properties of Light
Light travels in straight lines:
Laser

6. Light travels VERY FAST – around 300,000 kilometres per second.
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Light travels VERY FAST – around 300,000 kilometres per second.
This would be the same speed as a plane going around the world 8 times in one second.

7. Light travels much faster than sound. For example:
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Light travels much faster than sound. For example:
Thunder and lightning start at the same time, but we will see the lightning first.
2) When a starting pistol is fired we see the smoke first and then hear the bang.

8. We see things because they reflect light into our eyes:
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We see things because they reflect light into our eyes:
Homework

9. Shadows Shadows are places where light is “blocked”: Rays of light
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Shadows
Shadows are places where light is “blocked”:
Rays of light

10. Properties of Light summary
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Properties of Light summary
Light travels in ________ ______.
Light travels much _______ than sound.
We see things because they ______ light into our eyes.
________ are formed when light is blocked by an object.
Shadows faster straight lines reflect

11. Comparing speeds Speed km/sec Light Sound A car on a motorway
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Comparing speeds
Speed km/sec
Light
Sound
A car on a motorway
A person walking