Subject

Physics

How the world works, from pushes and pulls to atoms and relativity - one tiny step at a time.

Physics runs from everyday pushes and pulls through forces, motion, simple machines, energy, light, sound and electricity, then into kinematics, dynamics, gravitation, thermodynamics, waves, optics, electromagnetism and modern physics.

The early units are deliberately non-mathematical, building intuition about how things move and why. The maths arrives later, and by then the concepts it describes should already feel familiar rather than abstract.

Physics is the attempt to describe everything with as few rules as possible, and it succeeds well enough that the same equations govern a dropped ball and a planet. It is also where most people's everyday intuitions turn out to be wrong.

Units: 18
Steps: 359
Questions: 2,143

Who this track is for

Primary intuition building through to A-level and introductory undergraduate physics, including relativity and quantum basics.

How to approach it

Build intuition first - the equations describe things you should already picture
Always track units through a calculation, they catch most errors
Draw a force diagram before attempting any mechanics problem

Study guide · 9 min readHow to Learn PhysicsMost wrong physics answers come from a wrong picture, not wrong arithmetic. A guide to why intuition fails here specifically, why free-body diagrams are not optional, and what to do when the equations stop meaning anything.

What you will be able to do

Draw a free-body diagram and use it to predict what happens next
Say why an object moving at constant speed needs no net force
Distinguish heat from temperature and say why it matters
Explain what keeps a satellite up without using the word weightless

The thing people get wrong

That physics is mathematics with objects attached. The equations matter, but the difficulty is almost always conceptual - most wrong answers come from an incorrect picture of the situation rather than from arithmetic.

If you only do 3 units

Newton's laws are the core of classical mechanics and correct a lifetime of wrong intuitions. Energy is the accounting system that makes the rest tractable, and waves generalise to light, sound and almost everything that travels.

What the questions look like

8 real questions from across the Physics track, easiest first, each with the answer and the reason behind it. Every unit page below has thirty more.

Fact or fibLevel 1
1. A scientist should test an idea before believing it is true.
Answer: True
Testing ideas with careful experiments is how science checks what is true.
Choose all that applyLevel 1
2. Which of these show unbalanced forces, where something starts moving or speeds up?
- A car speeding up when the engine pushes itcorrect
- A sled sliding faster down a snowy hillcorrect
- A book lying still on a table
- A parked car staying in one place
A car speeding up and a sled sliding downhill have unbalanced forces, while resting objects have balanced forces.
Fact or fibLevel 1
3. North, south, east and west are directions on a compass.
Answer: True
A compass shows the four main directions: north, south, east and west.
Choose all that applyLevel 1
4. Which of these everyday tools are levers? Choose all that are.
- Scissorscorrect
- A crowbarcorrect
- A bottle openercorrect
- A mirror
Scissors, a crowbar and a bottle opener all turn on a fulcrum, so they are levers; a mirror is not.
Fact or fibLevel 1
5. Water freezes and turns to ice at 0 degrees C.
Answer: True
Water freezes into ice at 0 degrees C.
Build the sentenceLevel 1
6. Put the words in order to finish this rule about energy.
Answer: Energy is never lost it just changes form
Energy is never really lost - it just changes from one form into another.
Fact or fibLevel 1
7. A rainbow forms when sunlight shines through raindrops.
Answer: True
Raindrops split sunlight into its colours, which is why rainbows appear when it is both rainy and sunny.
Build the sentenceLevel 1
8. Build the true sentence about metals and electricity.
Answer: metals are good conductors
Metals conduct electricity well, so we use them for wires.

Units in Physics

Listed in the order they are meant to be worked through.

Practise Physics

2,143 questions, in tiny sessions you can finish in a few minutes.

Start playing

Where these questions come from. Each unit starts as a plan of the concepts it should cover and the difficulty it should span. Questions are written against that plan with AI assistance, then checked by a validator that rejects anything without a single defensible answer, an explanation, or plausible wrong options. How we write questions sets out the whole process, and corrections are fixed in the bank and reach the site and the app the same day.