Pearson Edexcel IAL Physics Past Papers & Mark Schemes

Physics mark schemes follow a predictable structure for calculation questions: 1 mark for selecting or stating the correct equation, 1 mark for correct substitution of values, and 1 mark for the correct answer with appropriate units. This means a three-mark calculation where you get the right answer but skip the equation and substitution will only score 1 mark. Always show the equation first, then substitute, then calculate. Units are non-negotiable in IAL Physics. Every numerical answer must have units, and they must be SI base or derived units (not mixed units like g/cm³ when kg/m³ is required). Learn to derive units from equations: pressure = force/area = N/m² = Pa. Energy = force × distance = N·m = J. This skill is also tested directly in 'show that' questions where deriving the unit of an unfamiliar quantity from its defining equation carries explicit marks. Free-body diagrams are the single most effective problem-solving tool in mechanics. Before writing any equations, draw the object as a dot, then draw and label every force acting on it — weight (always downward), normal reaction (perpendicular to surface), tension (along the string or rope), friction (opposing motion or tendency to move), and any applied forces. Resolve forces parallel and perpendicular to the direction of motion. Only then apply Newton's Second Law. For fields (gravitational and electric), understand the deep parallels: both follow inverse-square laws, both have field strength and potential concepts, both can be represented by field lines. But also understand the crucial difference: gravitational fields are always attractive, while electric fields can be attractive or repulsive. Questions that require comparison between the two fields are common at IAL level. Graph skills are heavily examined. Know how to extract physical quantities from gradients and intercepts: velocity-time graph gradient = acceleration, force-extension graph area = work done, V-I characteristic gradient = 1/resistance, ln(activity) vs time gradient = -λ (decay constant). Practise drawing lines of best fit, calculating gradients from large triangles, and identifying anomalous points.