The facts behind the questions — forces, energy, light, matter, space and the human body. Questions and answers are not listed here, so the game stays a game.
Starter11 questions
Gravity pulls all objects with mass towards each other. Earth is huge, so its pull is the one you feel.
Friction is the rubbing between two surfaces. It turns the ball's movement into heat.
The Moon has no air, so there's no air resistance — everything falls at the same rate. Astronauts tested this in 1971.
Plants capture sunlight, animals eat plants, and even coal and oil are ancient stored sunlight.
Reflection bounces light off a smooth surface at the same angle it arrived.
In a solid, particles are locked in place; in a liquid they slide past each other; in a gas they fly apart.
Water freezes at 0 °C and boils at 100 °C at sea level.
365¼ days — the leftover quarter is why we add a leap day every four years.
Earth turns once every 24 hours, so each side faces the Sun in turn.
In photosynthesis plants use carbon dioxide, water and sunlight, and release oxygen for us to breathe.
It beats about 100,000 times a day, pushing blood through some 100,000 km of vessels.
Explorer14 questions
A force can start movement, stop it, or change its direction.
Light travels about 300,000 km per second; sound about 343 m per second. That's why you see lightning before you hear thunder.
Kinetic energy is the energy of movement. The faster and heavier something is, the more it has.
Stored energy waiting to be released. Drop it and the potential energy becomes kinetic.
Red, orange, yellow, green, blue, indigo, violet — white light split by raindrops acting as prisms.
Sound needs particles to vibrate. Space is empty, so it is completely silent.
Heat gives the particles enough energy to escape the liquid — that's how puddles dry up.
H₂O: two hydrogen atoms bonded to one oxygen atom.
Mercury orbits in just 88 days, but Venus is actually hotter because of its thick atmosphere.
The Moon pulls on the oceans, raising a bulge of water on the side facing it.
It protects you, keeps water in, and controls your temperature by sweating.
Babies are born with about 300 — many fuse together as you grow.
Metals have loose electrons that carry current. That's why wires have copper inside and plastic outside.
Opposites attract; like poles push apart. Earth itself is a giant magnet, which is how a compass works.
Physicist7 questions
Named after Isaac Newton. One newton is roughly the weight of a small apple.
This is the law of conservation of energy, one of the most important rules in physics.
The sound wave bounces back to you. Bats and dolphins use this to 'see' in the dark.
Atoms join together to make molecules. A single drop of water holds about a billion trillion of them.
The Sun is an ordinary star — it only looks different because it is 270,000 times closer than the next one.
Tiny root hairs give a huge surface area for soaking up water and minerals.
Insulators like rubber and plastic keep current where it belongs — and keep you safe.