What pupils will know

• Materials can be solids, liquids or gases.
• Mixing some materials makes a new gas.
• A gas cannot be seen but it takes up space: it fills bubbles and blows up a balloon.
• Foam is a gas trapped inside a liquid.

Vocabulary and talk

material, solid, liquid, gas, bubble, foam, predict, measure, compare

Each word is shown with a picture and a gesture (a fist for solid, flowing hands for liquid, spread fingers for gas), then used in the sentence "I think ___ because ___."

Talk task: In pairs, pupils take turns to finish "I think the foam will ___ because ___" before the race, then say whether they agree with their partner and why.

Misconception we tackle

"Bubbles are empty" or "a gas isn't real because you can't see it." Pupils watch a balloon inflate with nothing visible going in, then explain that a gas is taking up the space.

Where it comes from and where it leads

Bakers in ancient Egypt used the gas bubbles made by yeast to make bread rise. In 1902, Aleksandr Loran, a school teacher in Baku, invented fire-fighting foam.

Maths: measuring and comparing heights on the giant foam ruler. In the real world, chemists and food scientists design foams, from fire-fighting foam to the bubbles in bread.

What pupils will know

• The properties of a material make it suitable or unsuitable for a job.
• Some materials spring back after squashing or stretching; others stay changed.
• Shape changes strength: a rolled tube is far stronger than a flat sheet of the same paper.
• Soft, springy materials absorb a force and protect what is inside.

Vocabulary and talk

material, property, squash, bend, twist, stretch, absorb, protect, suitable, strong

The class acts out each action together, and pupils explain their choices with the sentence "___ is good for ___ because it is ___."

Talk task: Pairs agree on the best material for the package and explain it to another pair, who ask one "Why?" question before they agree or disagree.

Misconception we tackle

"Thicker or heavier materials are always stronger" and "shape doesn't matter." The paper-tube book tower shows the same paper holding many books once its shape changes.

Where it comes from and where it leads

Engineer Fazlur Rahman Khan used the strength of tube shapes to design some of the world's tallest skyscrapers, including Chicago's Willis Tower.

Design and technology: building structures and making them stronger, stiffer and more stable. In the real world, packaging engineers design parcels that survive the post.

What pupils will know

• Magnetic forces act at a distance and can pass through some materials.
• Only some metals are magnetic (iron and steel); aluminium and copper are not.
• Magnets have a north and a south pole: like poles repel, unlike poles attract.

Vocabulary and talk

force, magnet, magnetic, attract, repel, pole, north, south, contact, distance

"Attract" and "repel" are taught with arm gestures (pull in, push away) and used in the sentence "The ___ is magnetic because ___."

Talk task: Pupils tell a partner why they think an object will stick, using "because", then the class agrees or disagrees by pointing to the evidence on the table.

Misconception we tackle

"All metals are magnetic." Pupils test an aluminium can and a steel spoon, and find out why newer 1p coins stick (they contain steel).

Where it comes from and where it leads

Navigators in China were steering ships with magnetic compasses more than 900 years ago.

Maths: counting and comparing results in a table. In the real world, giant magnets sort steel cans at recycling plants, and engineers use magnets in MRI scanners.

What pupils will know

• Every sound is made by something vibrating.
• Vibrations travel through a medium (solid, liquid or gas) to the ear.
• Shorter or tighter objects make higher-pitched sounds; stronger vibrations make louder sounds.
• Sounds get fainter as distance from the source increases.

Vocabulary and talk

vibrate, vibration, sound wave, medium, pitch, high, low, volume, loud, quiet, fainter

High, low, loud and quiet each have a hand gesture, and pupils describe what they find with the sentence "When the ___ vibrates, ___."

Talk task: Pairs describe what they can feel and hear using the pitch and volume words, then build on each other's explanation with "and also ___".

Misconception we tackle

"Louder means higher" and "sound only travels through air." The spoon bell and cup telephone show sound travelling through string, a solid.

Where it comes from and where it leads

Percussionist Dame Evelyn Glennie, who is profoundly deaf, performs around the world by feeling sound vibrations through her body.

Maths: reading scales and comparing measurements. In the real world, sound engineers, audiologists and musicians all work with vibration, pitch and volume.

What pupils will know

• Gravity pulls unsupported objects towards the Earth.
• Air resistance and friction act against motion.
• Forces are measured in newtons.
• Ramps, levers and pulleys let a smaller force move a load, but the effort has to move further.

Vocabulary and talk

force, newton, gravity, friction, air resistance, mechanism, lever, pivot, pulley, ramp, effort, load

Push, pull and gravity are taught with gestures, and pupils explain the result with the sentence "The pulley needed less force, but ___."

Talk task: Groups compare the four methods and reach a shared answer, with every pupil adding one reason or one reading before the group decides.

Misconception we tackle

"Heavier objects always fall faster" and "pulleys make the work disappear." Pupils see the force fall but the rope move further: the trade-off.

Where it comes from and where it leads

Archimedes used levers and pulleys in ancient Syracuse, and in 1206 the engineer Ismail al-Jazari wrote a famous book of machines built from gears and mechanisms.

Design and technology: mechanical systems (levers and pulleys). Maths: reading and comparing measurements. In the real world, crane operators and rescue engineers move heavy loads safely.

What pupils will know

• A circuit must be complete for current to flow.
• More cells (a higher voltage) make a bulb brighter or a buzzer louder.
• Switches open and close a circuit.
• Standard symbols represent circuit components.

Vocabulary and talk

circuit, complete, cell, battery, voltage, component, bulb, buzzer, switch, conductor, insulator, symbol, fault, evidence

Each circuit symbol is paired with a photo of the real component, and pupils use the sentence "The bulb is brighter because ___."

Talk task: In threes, one pupil tests, one records and one explains the evidence to the class, starting "We know it was the ___ because ___".

Misconception we tackle

"Current gets used up as it goes round the circuit." The human circuit shows one break stops everything, and the tester shows current returns to the cell.

Where it comes from and where it leads

Inventor Lewis Latimer improved the carbon filament inside early light bulbs, helping electric light last long enough to light homes and streets.

Design and technology: electrical systems in products. In the real world, electricians and power engineers keep a city's lights on.