An IB DP Physics skill pack on unit conversion (SL and HL, first assessment 2025): a rules reference, six worked examples and 62 graded practice items, every one answered. SI prefixes, compound units such as g/cm3, squared and cubed units. Free, and the whole pack.
Unit conversion is a technique the syllabus assumes but no topic owns, and the IB asks for it to be practised inside the topics that need it. This is not a taught unit: it supplements integrated teaching as reference and remedial material for a student losing marks on units, not physics.
This pack is worked, not taught: the teaching duration shown is student working time across the practice bank, about 160 minutes, not classroom delivery time. It divides into three sittings of about 55, 65 and 40 minutes.
What students learn:
- Building a conversion factor equal to 1 and putting the unwanted unit where it cancels, so the surviving units check the working
- Routing between two prefixes through the unprefixed unit, off a card of 14 metric multipliers
- Time in both directions, plus the litre, kilowatt hour, light year and electronvolt
- One factor per unit in a compound (95 km h⁻¹ is 26 m s⁻¹ by two moves, the origin of dividing by 3.6), and the whole factor raised to the power a squared or cubed unit carries: 1 m2 = 10^4 cm2
Three tiers: A, 41 fluency items in seven sets; B, 14 applied items where nothing signals a conversion; C, four multiple-choice items, every distractor explained, and three structured questions worth 26 marks.
IB skills (Tool 3: Mathematics): the pack teaches applying and using SI prefixes and units; students practise non-SI units, basic arithmetic and algebra, scientific notation, and areas and volumes for simple shapes.
What’s included:
- Student Worksheet (18 pages), answers stripped out, colour and printer-friendly B&W
- Teacher Key (28 pages), every answer and model solution, plus teaching notes
- The editable worksheet, a self-contained HTML file
The worksheet and the key are two projections of one source, so no answer file can drift. Grades 11-12 (ages 16-19).
Part of the A.1 Kinematics Complete Unit Bundle: every pack for the topic, 30% off buying them separately.
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