If your child comes home talking about entering the BPhO Year 7/8 or Junior Physics Challenge, the natural next question is: does that mean extra physics on top of school? The reassuring answer is no. Every fact tested traces back to mainstream KS3 physics — the kind covered across most Years 7-9 science schemes of work — dressed up as an everyday scenario rather than named outright. Below is a topic-by-topic map, using the same twelve facts from BPhO facts every KS3 child should know, showing exactly which KS3 area each one belongs to.

Forces (including gravity, mass and weight)

This is the biggest single area, and it's a core strand of KS3 physics from Year 7 onward. Five of the twelve facts in our BPhO toolkit deck sit here:

  • Balanced and unbalanced forces — recognising that a steady speed means the forces on an object are balanced, illustrated with a skydiver falling at constant speed with the parachute open.
  • Speed = distance ÷ time — the basic motion equation, plus sanity-checking an answer against real-world speeds.
  • Pressure = force ÷ area — how squeezing the same force into a smaller area increases the pressure, in newtons per square metre (pascals).
  • Mass vs weight — the distinction KS3 pupils meet early: mass in kilograms never changes, weight in newtons depends on gravity.
  • Weight = mass × gravitational field strength — the calculation itself, using Earth's g of about 10 N/kg.

If your child's science lessons have covered "forces," Newton's laws in outline, or gravity and weight, they've already met every idea in this list — a BPhO question just asks them to spot which one a skydiver or a set of bathroom scales is really testing.

Energy

Energy stores and transfers is a standalone KS3 topic in its own right, usually introduced early in Year 7 or Year 8 and returned to repeatedly. Two facts from our deck live here:

  • Energy stores and transfers — how lifting an object fills its gravitational potential store, and releasing it transfers that energy into kinetic and thermal stores, with the total conserved throughout.
  • Unit prefixes on power ratings — recognising that "kilo-" always means ×1000, using a kettle's power rating as the example.

Both of these are standard KS3 energy-unit content; the second one leans slightly into the numeracy side of physics (unit conversion), which is exactly the kind of cross-subject fluency KS3 maths and science are meant to reinforce together.

Electricity and magnetism

Circuits are one of the most hands-on parts of KS3 physics — most schools run a practical component alongside the theory. Two facts here:

  • Ammeters and voltmeters — which instrument measures what, and how each is wired into a circuit (series for current, parallel for potential difference).
  • Series vs parallel circuits — why a break in a series loop stops everything, while a parallel circuit's branches keep working independently.

If your child has built or drawn circuit diagrams in science, or used a multimeter in a practical, this is exactly that content — a BPhO question just wraps it in a scenario, like a house's lighting circuit, rather than asking for a diagram directly.

Waves: sound

Sound as a wave that needs a medium is a KS3 waves-topic staple. Two facts here:

  • Sound needs a medium — why a bell in a sealed, air-evacuated jar goes silent, and why space itself is silent.
  • The speed of sound in air (about 340 m/s) — used both for thunder-and-lightning distance estimates and for echo questions, where the sound makes a round trip.

This sits alongside light as a KS3 waves topic, and the "does it need a medium?" contrast between sound and light is one of the more memorable ideas in the unit — which is probably why it turns up in a quiz format so naturally.

Matter: density

One fact from our deck sits in the KS3 particle-model-of-matter strand:

  • Density = mass ÷ volume — why a block of wood floats and a same-sized block of iron sinks, using water (1 g/cm³) as the reference point.

Density is usually introduced alongside the particle model, and the "does size decide it, or does density decide it?" framing — a huge log floats, a tiny nail sinks — is a classic way KS3 schemes test whether the idea has actually landed.

The takeaway for a worried parent

Every single fact above sits inside physics your child is either doing right now or will meet within KS3 — none of it reaches ahead into GCSE content, and none of it requires anything beyond what a typical science scheme of work already covers. What the BPhO challenges add isn't new content; it's the requirement to recognise which idea a real-world scenario is testing, quickly, without the topic being named for you. That's a genuinely useful skill on its own, and it's also exactly what spaced, fact-level practice is good at building, because it trains the recall to be instant rather than something reasoned out from scratch each time.

If you'd rather see the misconceptions this content tends to produce, common BPhO mistakes and misconceptions covers those directly, fact by fact.

FAQ

Does my child need to learn extra physics to do well in a BPhO challenge?

No. Every topic tested — forces, gravity, energy, electricity, sound, and density — is mainstream KS3 physics content, the kind covered in a typical Years 7-9 science scheme of work. The challenge is in applying it to an unfamiliar scenario under light time pressure, not in knowing more than the syllabus.

Which KS3 physics topic comes up most in the BPhO challenges?

Forces is the biggest single area — it covers balanced and unbalanced forces, speed, pressure, and mass and weight (including gravity), which together make up roughly half of our BPhO toolkit flashcard deck.

If it's just KS3 content, why do some children find BPhO questions hard?

Because the questions describe everyday situations rather than naming the topic outright — a skydiver, a thunderclap, a block of wood in water — so a child has to first recognise which physics idea applies before they can use it. That's a reasoning skill on top of the content, not extra content.

Duke Harewood built aitutors.me's KS3 physics tutor, Professor Newton, to teach exactly this curriculum — this map grew out of building the flashcard deck alongside it. Updated 26 August 2026.