Step 1: Read it twice and find what's actually asked

Before touching your calculator, read the whole question and identify the final quantity you're solving for. Multi-step problems bury the target - "find the final velocity" might require force, then acceleration, then kinematics. Knowing the destination first lets you work backwards to the path.

Step 2: List your knowns and unknowns - with units

Write down every given value with its unit, and what you're solving for. This sounds basic, but it does two things: it surfaces the quantities you'll need to bridge, and it catches unit mismatches (grams vs kilograms, centimetres vs metres) before they cost you the answer. Convert everything to consistent units now, not halfway through.

Step 3: Map the path before you calculate

Identify which principle connects what you have to what you want - and if there's a gap, find the intermediate quantity that bridges it. A typical chain: the question gives you mass and a force, you need velocity, so the path is force ? acceleration (Newton's second law) ? velocity (a kinematics equation). Sketch the chain in two or three arrows before you compute anything. This is the step that separates top answers from lost ones.

Step 4: Work one step at a time, carrying units

Solve each link in the chain in order, keeping units attached to every number. Carrying units is a built-in error check - if your units don't come out as metres per second when you expected a velocity, you've made a structural mistake, and you've caught it before the final line.

Step 5: Show every step - the marks are in the working

This is the single most important habit in Physics exams: examiners award marks for the method, not just the final number. If you write the right equation and substitute correctly but slip on the arithmetic, you still earn most of the marks - but only if your working is on the page. Set out each step clearly: equation, substitution, result. A correct final answer with no working can score less than a wrong answer with sound method shown.

Step 6: Sanity-check the magnitude

Before you move on, ask whether the answer is physically sensible. A car accelerating at 4,000 m/s2, an electron with the mass of a marble - these are signals you dropped a power of ten or mismatched a unit. A two-second plausibility check catches errors that would otherwise carry through the rest of the question.

A worked shape

"A 2 kg object experiences a net force of 10 N from rest - find its velocity after 3 s." Target: velocity. Knowns: m = 2 kg, F = 10 N, t = 3 s, u = 0. Path: F ? a (a = F/m = 5 m/s2) ? v (v = u + at = 0 + 5×3 = 15 m/s). Units check out (m/s), magnitude is sensible. Notice the method is visible at every step - that's what earns the marks.

Works for HSC, VCE, QCE and WACE. Multi-step problem-solving is rewarded in every senior Physics course, and showing working for method marks is universal. Note on practice papers: Cluey Plus Practice Exams cover HSC (NSW) Physics at launch; students in other states can apply this exact method to their own past papers from VCAA, QCAA or SCSA.

Practise the method on real questions

This method only becomes automatic by repetition under exam conditions. Cluey Plus Practice Exams include full HSC Physics papers so NSW students can drill multi-step calculations and check their working against the marking guidance - exactly where method marks are won or lost. Start a free 14-day Cluey Plus trial and work a multi-step Physics question end to end this week.