--- title: Physics — a course of Mova's primary school, with trees and pragmatics description: Forces and motion around a child: why things fall, the pull of the Moon and the planets, parachutes, pushes and pulls, friction, balance and the centre of gravity, riding a bike, swings and pendulums, floating and sinking, light, sound, magnets and electricity. 44 lessons, 729 sentences with trees a --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/physics/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / Physics # Physics Forces and motion around a child: why things fall, the pull of the Moon and the planets, parachutes, pushes and pulls, friction, balance and the centre of gravity, riding a bike, swings and pendulums, floating and sinking, light, sound, magnets and electricity. The physics course of Mova's primary school: 44 lessons, 729 sentences, each sentence with its syntax tree and pragmatics. Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/) (Mova corpus 0.4). - [1](https://md.mova.elamur.ai/free/en/corpora/school/physics/1-why-things-fall/) — Why things fall: the apple and the pull of the Earth — 17 sentences · Everything that has mass pulls on everything else, and this pull is called gravity. - [2](https://md.mova.elamur.ai/free/en/corpora/school/physics/2-the-moon-the-planets-and-the-pull/) — The Moon, the planets and the pull that holds them — 19 sentences · Swing a ball on a string round your head: the string keeps pulling the ball towards your hand and bends its… - [3](https://md.mova.elamur.ai/free/en/corpora/school/physics/3-parachutes-and-falling-safely/) — Parachutes, skydivers and falling safely — 17 sentences · The faster something falls and the bigger the side it turns to the air, the harder the air pushes back on it. - [4](https://md.mova.elamur.ai/free/en/corpora/school/physics/4-pushes-and-pulls-move-and-stop/) — Pushes and pulls: what makes things move and stop — 16 sentences · A push or a pull is called a force, and a force is what starts things moving, stops them, speeds them up or… - [5](https://md.mova.elamur.ai/free/en/corpora/school/physics/5-pushes-and-pulls-all-around-us/) — Pushes and pulls all around us — 16 sentences · Every move you make is a push on something else that pushes you back: you walk forward by pushing the ground… - [6](https://md.mova.elamur.ai/free/en/corpora/school/physics/6-friction-the-grip/) — Friction: the grip that stops and helps — 17 sentences · Friction is the grip between two surfaces that touch: rough surfaces pressed hard together grip a lot, smoot… - [7](https://md.mova.elamur.ai/free/en/corpora/school/physics/7-living-with-friction/) — Living with friction: oil, wheels and grip — 17 sentences · To make it smaller, we put oil between rubbing parts, or we use wheels and ball bearings so that things roll… - [8](https://md.mova.elamur.ai/free/en/corpora/school/physics/8-balance-the-centre-of-gravity/) — Balance: the centre of gravity — 15 sentences · Every object acts as if all its weight sat at one point, its centre of gravity, and it balances when that po… - [9](https://md.mova.elamur.ai/free/en/corpora/school/physics/9-riding-a-bike/) — Riding a bike: why it stays up — 18 sentences · A bike stays up not by holding still but by steering: whenever it starts to tip, you turn the front wheel a… - [10](https://md.mova.elamur.ai/free/en/corpora/school/physics/10-swings-and-pendulums/) — Swings and pendulums — 17 sentences · A swing is a pendulum: a weight hanging from a point, going back and forth with its own steady rhythm. - [11](https://md.mova.elamur.ai/free/en/corpora/school/physics/11-floating-and-sinking/) — Floating and sinking: the push of the water — 18 sentences · Water pushes up on anything you put in it, and the push is as big as the weight of the water the thing moves… - [12](https://md.mova.elamur.ai/free/en/corpora/school/physics/12-ice-submarines-and-balloons/) — Floating in the real world: ice, submarines and balloons — 16 sentences · The rule of floating works for ice, oil, ships and even air: whatever is lighter for its size rises above wh… - [13](https://md.mova.elamur.ai/free/en/corpora/school/physics/13-water-safety-and-the-ocean/) — Water safety and the ocean — 15 sentences · The deeper you go in water, the harder it presses, because more and more water is piled up above you; you fe… - [14](https://md.mova.elamur.ai/free/en/corpora/school/physics/14-the-air-presses-on-everything/) — The air presses on everything — 14 sentences · We live at the bottom of a deep ocean of air, and all that air above us has weight, so it presses on everyth… - [15](https://md.mova.elamur.ai/free/en/corpora/school/physics/15-wind-and-weather/) — Wind and weather — 18 sentences · Wind is simply air on the move, and air moves from places where it presses harder to places where it presses… - [16](https://md.mova.elamur.ai/free/en/corpora/school/physics/16-pressure-tricks-pumps-tyres-vacuums/) — Pressure tricks: pumps, tyres and vacuums — 17 sentences · Air always moves from where it is squashed and presses harder to where it presses less, and many machines in… - [17](https://md.mova.elamur.ai/free/en/corpora/school/physics/17-what-sound-is-wobbles-in-the-air/) — What sound is: wobbles in the air — 17 sentences · Every sound starts with something wobbling very fast: a guitar string, a drum skin, or the vocal cords in yo… - [18](https://md.mova.elamur.ai/free/en/corpora/school/physics/18-thunder-sirens-and-how-fast-sound-travels/) — Thunder, sirens and how fast sound travels — 17 sentences · Sound is fast, but nowhere near as fast as light: in air it goes about one kilometre every three seconds, wh… - [19](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/) — Bangs and loud sounds: firecrackers and ears — 18 sentences · A bang is one sudden, hard shove on the air: instead of a gentle wobble, the air is pushed out all at once i… - [20](https://md.mova.elamur.ai/free/en/corpora/school/physics/20-light-and-shadows/) — Light and shadows — 16 sentences · Light comes from things that shine, like the Sun, a lamp or a fire, and it travels in straight lines, faster… - [21](https://md.mova.elamur.ai/free/en/corpora/school/physics/21-mirrors-rainbows-and-the-blue-sky/) — Mirrors, rainbows and the blue sky — 14 sentences · A mirror is so smooth that light bounces off it neatly, at the same angle it arrived, so the picture stays w… - [22](https://md.mova.elamur.ai/free/en/corpora/school/physics/22-lenses-and-eyes/) — Lenses and eyes — 17 sentences · A lens is a piece of clear glass or plastic with curved sides that bends light on its way through; a lens th… - [23](https://md.mova.elamur.ai/free/en/corpora/school/physics/23-heat-moves-hot-to-cold/) — Heat moves: hot to cold — 16 sentences · Heat always flows from a hotter thing to a colder thing, never the other way, until both are the same temper… - [24](https://md.mova.elamur.ai/free/en/corpora/school/physics/24-melting-freezing-and-boiling/) — Melting, freezing and boiling — 17 sentences · Water can be solid ice, liquid water, or an invisible gas called water vapour, and adding or taking away hea… - [25](https://md.mova.elamur.ai/free/en/corpora/school/physics/25-keeping-warm-and-keeping-cool/) — Keeping warm and keeping cool: insulation and sweat — 17 sentences · A woolly jumper does not make any heat; your body makes it, and the jumper traps still air between its fibre… - [26](https://md.mova.elamur.ai/free/en/corpora/school/physics/26-static-electricity-balloons-hair-and-sparks/) — Static electricity: balloons, hair and sparks — 17 sentences · Everything is made of tiny bits that carry electric charge, and rubbing two things together can move some of… - [27](https://md.mova.elamur.ai/free/en/corpora/school/physics/27-batteries-circuits-and-how-electricity-flows/) — Batteries, circuits and how electricity flows — 14 sentences · Electricity only flows when it has a complete loop to go round, from the battery, through the bulb and back… - [28](https://md.mova.elamur.ai/free/en/corpora/school/physics/28-electricity-and-safety/) — Electricity and safety — 16 sentences · Electricity flows wherever it finds a path to somewhere with a different push, such as the ground, and a hum… - [29](https://md.mova.elamur.ai/free/en/corpora/school/physics/29-magnets-pulling-and-pushing-without-touching/) — Magnets: pulling and pushing without touching — 14 sentences · A magnet can pull a paper clip across the table without touching it, through an invisible region around it c… - [30](https://md.mova.elamur.ai/free/en/corpora/school/physics/30-compasses-and-the-magnetic-earth/) — Compasses and the magnetic Earth — 17 sentences · The whole Earth behaves like a giant magnet, and a compass needle is simply a little magnet free to turn, so… - [31](https://md.mova.elamur.ai/free/en/corpora/school/physics/31-energy-what-makes-things-happen/) — Energy: what makes things happen — 18 sentences · Energy is what lets things move, heat up, light up or change; you cannot see it, but you can see what it does. - [32](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/) — Fuels, the Sun and saving energy — 18 sentences · A log on a campfire holds energy the tree caught from sunlight; burning joins the wood with oxygen from the… - [33](https://md.mova.elamur.ai/free/en/corpora/school/physics/33-levers-lifting-heavy-things-with-a-little-push/) — Levers: lifting heavy things with a little push — 15 sentences · A lever is a stiff bar that turns round a fixed point called a pivot, and it lets a small push do a big job. - [34](https://md.mova.elamur.ai/free/en/corpora/school/physics/34-wheels-axles-ramps-and-screws/) — Wheels, axles, ramps and screws — 15 sentences · Try turning the thin metal bar inside a door when the handle has come off: it is really hard, yet with the h… - [35](https://md.mova.elamur.ai/free/en/corpora/school/physics/35-pulleys-gears-and-big-machines/) — Pulleys, gears and big machines — 16 sentences · At school assembly someone pulls the flagpole rope down and the flag climbs up: a single wheel at the top, a… - [36](https://md.mova.elamur.ai/free/en/corpora/school/physics/36-speed-fast-and-slow/) — Speed: fast and slow — 17 sentences · Speed is how far you go in a certain time: when the car's speedometer shows 50, the car would cover 50 kilom… - [37](https://md.mova.elamur.ai/free/en/corpora/school/physics/37-seat-belts-crashes-and-keeping-safe/) — Seat belts, crashes and keeping safe — 15 sentences · In a crash the car stops in a moment, but everything inside it, you, your bag and the dog, keeps moving forw… - [38](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/) — Rockets, record speeds and motion everywhere — 16 sentences · You can feel the same push back when a garden hose wriggles as the water rushes out, and a squid uses it to… - [39](https://md.mova.elamur.ai/free/en/corpora/school/physics/39-day-and-night-and-the-moons-faces/) — Day and night, and the Moon's faces — 17 sentences · The Sun seems to climb up in the east and sink in the west, but it is really the Earth spinning towards the… - [40](https://md.mova.elamur.ai/free/en/corpora/school/physics/40-seasons-and-tides/) — Seasons and tides — 17 sentences · The Earth is tilted, so as it travels round the Sun each year, first one half and then the other leans towar… - [41](https://md.mova.elamur.ai/free/en/corpora/school/physics/41-alice-s-fall-and-sizes-falling-the-centre-of-the-earth-giants-and-tiny-people/) — Alice's fall and her sizes: falling, the centre of the Earth, giants and tiny people — 18 sentences · Alice falls down the rabbit hole so slowly that she takes a jar of orange marmalade off a shelf on the way a… - [42](https://md.mova.elamur.ai/free/en/corpora/school/physics/42-olympiad-forces-floating-and-machines/) — Olympiad: forces, floating and machines ★★★ — 17 sentences · This olympiad block closes the course: each puzzle hides one sharp idea from the earlier lessons, and the tr… - [43](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/) — Olympiad: sound, light, heat, electricity and magnets ★★★ — 18 sentences · This block mixes the wobbles, rays and flows of the course, sound, light, heat, electricity and magnets, int… - [44](https://md.mova.elamur.ai/free/en/corpora/school/physics/44-olympiad-speed-space-and-seasons/) — Olympiad: speed, space and seasons ★★★ — 18 sentences · The last olympiad lesson goes fastest and furthest: speeds, rockets, the spinning Earth, the Moon, tides and… - ← previous: [Myths](https://md.mova.elamur.ai/free/en/corpora/school/myths/) - next →: [Politics](https://md.mova.elamur.ai/free/en/corpora/school/politics/) - ↑ back to [the school](https://md.mova.elamur.ai/free/en/corpora/school/)