O-Level Physics Graphing & Linearisation Clinic

TL;DR
Paper 3 expects clean tables, full-page graphs, and linearised relationships that feed ACE analysis (Section 4, SEAB 2026 syllabus).
Make every plot a straight line by choosing the right axes (reciprocals, logs, gradients/intercepts tied to physical constants).
Always include raw points, best-fit line, large gradient triangle, and uncertainty commentary.

Keep Your Physics Practical Stack On Track

Use our O-Level Physics Experiments hub to find companion drills for every Paper 3 skill before you attempt these walkthroughs.

1 | Graphing checklist before you touch the ruler

• Use at least half of the grid in both x and y directions.\
• Mark raw points with small crosses; no thick dots.\
• Label axes with quantity + unit (e.g. 1/u / cm⁻¹).\
• Choose a sensible scale (multiples of 1, 2, 5 × powers of ten).\
• Draw a thin best-fit line; no connecting-the-dots.\
• Sketch a large triangle covering ≥2/3 of the line for gradient.

2 | Common Paper 3 relationships and how to linearise them

Reviewed by

Chee Wei Jie·Academic Advisor (Physics)

Practical course completion-record note

For practical, lab, and experiment courses, Eclat Institute maintains centre-held attendance records and may also issue an internal attendance or completion document based on participation and internal assessment.

• For SEAB private-candidate declarations, the key evidence is the centre's attendance or completion record, not a government-issued certificate.
• This is an internal centre-issued certificate, not an MOE/SEAB qualification or accreditation.
• Recognition (if any) is determined by the receiving school, institution, or employer.
• For SEAB private candidates taking science practical papers, SEAB states you should either have taken the subject before or attend a practical course and complete it before the practical paper date.

View our sample completion document (Current sample layout (design may be refined over time))