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ÌÇÐÄVlog

Last updated

13 November 2026

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IB DP Physics circular motion lesson pack on centripetal force and free-body diagrams, Topic A.2 Forces and momentum, SL and HL, first assessment 2025. It shows what makes a body go round a circle. Editable worksheet, 69-slide lesson deck, teacher key, worked solutions and a questions-only assessment, supplied as self-contained HTML plus colour and black-and-white PDF.

What students learn

  • Centripetal force is not a new force: it is the resultant of the real forces, towards the centre and at right angles to the velocity.
  • Four cases, four real forces: an orbit, a conical pendulum, a car on a roundabout and a cyclist on a banked track.
  • Students build F = mv²/r = mω²r from Newton’s second law and resolve tensions at an angle.
  • Why the direction changes but the speed does not, and why the speed can change on a vertical circle.
  • Vertical circles, top and bottom only: tension, normal force and the least speed, v = √(gr).

IB skills (Tool 3: Mathematics, with Inquiry 3), all practised:

  • Draw and interpret free-body diagrams.
  • Resolve vectors.
  • Select and manipulate equations.
  • Draw curves of best fit.
  • Linearize graphs, only where appropriate.
  • Extrapolate graphs.
  • Identify and discuss random and systematic errors.

What’s included:

  • Student Worksheet - 23 pages
  • Teacher Key - 40 pages
  • Worked Solutions - 26 pages
  • Assessment - 18 pages
  • Lesson deck - 69 slides

Ten written questions carry 76 marks across 41 parts, plus five multiple-choice items. The class works Questions 1 to 6, worth 38 marks, in the lesson. The rest go home, ending on a nine-mark data question in the Paper 1B pattern. Students draw and extend a curve for a whirled bung, suggest a straight-line graph and find the fault in how each length is set. Seven of the thirteen figures have answer layers, stripped from the student copy.

Banked bends are drawn, never calculated, as the guide asks. As the topic’s last lesson, it carries the guide’s eight A.2 linking questions, each where it connects, and a Nature of Science box. SI units, IB notation and IB command terms throughout. Use it with grades 11-12 (ages 16-19) as a lesson, cover lesson, homework or revision.

Part of the A.2 Forces and Momentum Complete Unit Bundle, 30% off buying the packs separately.

Related resources:

Updated 13 Nov 2026: please reprint.
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Get this resource as part of a bundle and save up to 30%

A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

Bundle

IB DP Physics (2025) A2 Forces and Momentum Complete Bundle

The complete Topic A.2 Forces and momentum unit for IB DP Physics, SL and HL, first assessment 2025: ten lesson packs, a bench practical, the SL and HL topic test and two vector skill packs, 30% off buying them separately. **What's in the unit** - Ten lesson packs in teaching order: Contact and Field Forces; Free-Body Diagrams and Force Pairs; Resultant Force, Inertia and Newton's First Law; Newton's Second Law: F = ma; Friction: Static and Dynamic; Upthrust, Viscous Drag and Terminal Velocity; Momentum, Impulse and F = Δp/Δt; Collisions and Explosions; Circular Motion I: Angular Velocity and Centripetal Acceleration; and Circular Motion II: Centripetal Force. - A bench practical, Investigating Newton's Second Law: a trolley lab at fixed mass, then at fixed force, as a full pack with its own deck. - The Topic A.2 test: SL and HL question papers with AO-tagged mark schemes, 36 marks in 50 minutes at SL and 43 marks in 60 at HL. - Two vector skill packs: Resolving Vectors, with more than 100 answered practice items, and Adding and Subtracting Vectors, with 35. Together the ten lessons cover all 24 understandings of Topic A.2, from forces as interactions and Hooke's law to Newton's three laws, friction, drag, momentum, collisions and circular motion. The topic test assesses all 24. **Every lesson pack includes:** - An editable student worksheet - A teacher key with every answer and marking point - Worked solutions with every step and its units - A questions-only assessment with IB mark allocations - A choreographed lesson deck with staged reveals Across the ten: 191 student worksheet pages, 304 teacher key pages and 505 slides. **IB skills (mostly Tool 3: Mathematics):** free-body diagrams; drawing, adding and resolving vectors; scale diagrams; direct and inverse proportionality; selecting and manipulating equations; plotting, best-fit lines, gradients, intercepts and linearizing; uncertainty bars and lines of maximum and minimum gradient; means, ranges and propagated uncertainties; and, from Inquiry 1, 2 and 3, designing a method, controlling variables, judging outliers and identifying random and systematic errors. Everything ships as self-contained HTML that opens in any browser with nothing to install, every worksheet editable, plus colour and black-and-white PDF of every document. The test's grade boundaries are set by YPhysics, not the IB, and you can edit them. SI units, IB notation and IB command terms throughout. Suitable for grades 11-12 (ages 16-19) for first teaching, assessment and revision. **Also in the catalogue, sold separately:** - [A.1 Kinematics Complete Unit Bundle, the topic before this one](/teaching-resource/resource-13537351) - [Foundations of Motion: Distance and Displacement, a whole lesson pack in this format, free](/teaching-resource/-13516114) *A rating helps other teachers find this.*

£81.90

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