SL and HL
A.2 Forces and momentum
Why does motion change? A.2 has three parts: forces, circular motion and linear momentum. All three parts are ready: notes, visual guides, levelled practice and IB-format practice for each.
The big idea in one minute
ΣF = ma · ΣF = Δp/Δt
A force is an interaction between two bodies. Draw every force on one body, add them up, and Newton’s laws tell you how the motion changes: no net force, no change in velocity; a net force, an acceleration in the same direction.
Your path through A.2
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Concept builders
Begin every part of this topic with its concept builder: predict, test with the simulation, explain. Then read the notes, practise, and finish with the papers.
Concept builder: predict, test, explain
Three guided lessons with simulations: predict, test, explain. Done in class.
Skill drill
New numbers every time, on forces: friction, buoyancy, lifts and pulleys. The page marks your answer and shows the steps. Use g = 9.8 m s⁻² and give answers to 3 significant figures.
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🔒 The circular motion and momentum questions are part of the full course.
Full course resources are available to enrolled students through an access code.
The drill above uses forces questions only. With an access code it also gives ω and v, centripetal force, bends, vertical circles, impulse, collisions, recoil and explosions.
Enrolled student? Enter your access code.
You only need to do this once on each device.
Free to try, no code needed: A.1 Kinematics · A.2 Forces · B.1 Thermal energy transfers · C.1 Simple harmonic motion · D.1 Gravitational fields · E.1 Structure of the atom · IA guide
Part 1 · Forces
Forces notes
The full topic: worked examples, the markscheme words and the common mistakes.
Levelled practice
Levels 1–4 with hints and worked answers. Goal: a ★ at Level 2 in every topic. For a 6 or 7, get Levels 3 and 4 too.
IB-format practice: Paper 1A
Timed papers with markschemes, done as homework or classwork. One attempt: your report goes to your teacher.
IB-format practice: Paper 2
Timed papers with markschemes, done as homework or classwork. One attempt: your report goes to your teacher.
Part 2 · Circular motion
Circular motion notes
The full topic: worked examples, the markscheme words and the common mistakes.
Circular motion levelled practice
Levels 1–4 with hints and worked answers. Goal: a ★ at Level 2 in every topic. For a 6 or 7, get Levels 3 and 4 too.
IB-format practice
Timed papers with markschemes, done as homework or classwork. One attempt: your report goes to your teacher.
Part 3 · Linear momentum
Linear momentum notes
The full topic: worked examples, the markscheme words and the common mistakes.
Momentum levelled practice
Levels 1–4 with hints and worked answers. Goal: a ★ at Level 2 in every topic. For a 6 or 7, get Levels 3 and 4 too.
IB-format practice
Timed papers with markschemes, done as homework or classwork. One attempt: your report goes to your teacher.
For all of A.2: quizzes
Three quizzes: forces, circular motion, momentum
3 quizzes of 10 questions, 30 minutes each, one attempt. Your teacher gives you the answers later.
Extra help
Not a step: use these when you are stuck, or to revise.
Circular motion visual guide
7 figures you can move. Use them when an idea does not make sense.
Linear momentum visual guide
8 figures you can move. Use them when an idea does not make sense.
Can I do this?
Tick what you can do without notes. Saved on this device only.
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