02Thermal physics
Heat is motion.
Each dot is a particle of gas in a closed box. As the temperature rises the particles move faster: their average kinetic energy grows with the absolute temperature.
- Rule
- higher T → faster particles
- Now
- 300 K
Cambridge IGCSE Physics · 0625 / 0972
Physics you can touch, not just read.
Every law in the syllabus becomes a working lab. Change a variable, predict the result, then learn exactly how to write it for full marks.
- Syllabus topics
- 6
- Interactive labs
- 48
- Exam-style questions
- 1,200
- t
- 0.00 s
- x
- 0.00 m
- fallen
- 0.00 m
- |v|
- 12.00 m/s
x = vₓt
s = ½gt²
Physics in motion
04Electricity & magnetism
Fields you can see.
Field lines leave the north pole and enter the south pole, crowding together where the field is strongest.
- Strongest
- at the poles
- Force on a wire
- F = BIL
05Nuclear physics
Decay is random.
Every nucleus has the same chance of decaying each second. You cannot say which one goes next, yet half of them always go within one half-life.
- After n half-lives
- N = N₀ ⁄ 2ⁿ
- Now
- 100% remain
06Space physics
Further out, slower.
Planets further from the Sun travel more slowly and take far longer to complete one orbit. The outer planet here needs about five inner-planet years for one orbit.
- Orbital speed
- v = 2πr ⁄ T
- Held by
- the Sun’s gravity
§1 The syllabus
Six topics, one syllabus.
Core and Supplement content are marked separately, so you only study what your paper needs. Each topic is a run of short labs followed by exam-style checks.
- In progress
- Not started
- Supp. Supplement only
Motion, forces & energy
Speed–time graphs, momentum, moments, work and power.
7 / 12 labs
Thermal physics
Kinetic particle model, gas pressure, specific heat capacity.
2 / 7 labs
Waves, light & sound
Refraction, lenses, the electromagnetic spectrum, sound.
4 / 10 labs
Electricity & magnetism
Circuits, Ohm’s law, the motor effect, transformers.
1 / 11 labs
Nuclear physics
The nuclear atom, radioactive decay, half-life.
0 / 5 labs
Space physics
The Solar System, orbits, stars and the Universe.
0 / 3 labs
§2 How a lab works
Predict, play, prove.
Every lab follows the same three steps, built around how examiners award marks: intuition first, then the exact wording that scores.
-
i.
Predict
Commit to an answer before anything moves. A wrong guess is where the idea sticks.
ExampleDouble the launch speed. Does the flight time halve, stay the same, or double?
HalvesSameDoubles -
ii.
Play
Change variables, pause time, take readings. Graphs and equations update as you go.
Your readingsvₓ / m s⁻¹ t / s 8.0 1.43 12.0 1.43 16.0 1.43 -
iii.
Prove
Build a full-mark answer from mark-scheme keywords, then try past-paper questions.
Mark scheme · 2 marks“Horizontal velocity is constant; the vertical motion depends only on gravity, so the time is unchanged.”
§3 Exam technique
Read the command word.
The first word of a question tells you how much to write. Demand rises from recalling a fact to applying physics in a new situation — and so do the marks. Choose a level to see a model answer.
demand
§4 Daily six
Six questions, one from each topic.
Everyone gets the same six today, so you can compare scores with your class. Your answers are kept on this device until tomorrow’s set.
Your first lab takes five minutes.
No sign-up needed. Open a lab and start experimenting.
Open the refraction lab