Light and shadows Lesson 20 of the physics course of Mova's primary school: 16 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: the lesson at school .
0 Light comes from things that shine, like the Sun, a lamp or a fire, and it travels in straight lines, faster than anything else. 1 We see most things because some of that light bounces off them into our eyes; in a room with no light at all you see nothing, however long you wait. 2 When something blocks the light, it leaves a dark patch behind it in its own outline: a shadow, like your hand rabbit on the bedroom wall. 3 A low morning Sun stretches your shadow long across the playground, while the high Sun at midday shrinks it to a puddle at your feet. 4 Light things bounce most light away and dark things soak it up and turn it into warmth, and the colour you see is the light a thing bounces back to you. 5 Light travels in straight lines and cannot bend round you, so your body leaves a shadow where it blocks the sunlight. 6 On a cloudy day light comes from all over the sky, so shadows are faint or missing. 7 Shadows are long when the Sun is low in the morning and evening and short when it is high at midday, and sundials used shadows to tell the time. 8 A shadow shows the outline of the thing in the way, and moving a hand closer to the lamp makes its shadow bigger. 9 We see a book because light from a lamp or the Sun bounces off it into our eyes. 10 Light goes about 300,000 kilometres every second, and sunlight takes about eight minutes to reach the Earth. 11 Starlight takes years, even thousands of years, to reach us, so we see each star as it was when its light set off. 12 White things reflect most light and dark things absorb it and turn it into heat, so a white T-shirt keeps you cooler in the Sun. 13 A cat's eyes shine in headlights because a mirror-like layer at the back of the eye bounces light back out, helping the cat see in dim light. 14 A red apple looks red because it bounces red light and soaks up the other colours; under a blue lamp it looks almost black. 15 A reflective strip bounces car headlights straight back to the driver, so a cyclist wearing one is seen from much further away. ← previous Bangs and loud sounds: firecrackers and earsnext → Mirrors, rainbows and the blue sky↑ back to Physics This page in Markdown → https://md.mova.elamur.ai/free/en/corpora/school/physics/20-light-and-shadows/