1. Light is a form of energy that travels away from a source in straight lines at a very high speed of 300,000 km/s. 2. Light has natural sources like the sun and stars, and artificial sources like candles, lamps, and flashlights that produce light when burning or heating. 3. Experiments showing light traveling through screens demonstrate that light travels in straight lines from its source.

1. LIGHT – Lesson 1 Targets 1. To know that light is a form of energy which travels away from a source in straight line 2. To learn that light travels at a very high speed

2. Making light Light needs an energy source to be created. Once created it travels at high speed (3 000 000 metres per second) away from the source

3. Sources of light Natural sources Sun. Moon (reflected sunlight). Burning wood. Lightning Stars Artificial sources Candles. Lamps. Flashlight bulbs. TV. Projector

4. 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.

5. How fast does light really travel Across a field in less than one millionth of a second. From the Moon in 1.3 seconds From the Sun in 8 minutes From the nearest star in 4 years

6. Light travels VERY FAST – around 300,000 kilometres per second. At this speed it can go around the world 8 times in one second.

7. Light travels in straight lines.

8. Light travels in straight lines Three screens experiment shows that this is true

9. Light travels in straight lines Three screens experiment shows that this is true

10. Amazing fact To see light you have to destroy it, once it enters your eye it does not come out but is absorbed by the cells on the retina!

11. Shadows Copy the diagram and draw lines to show how a shadow is formed