Why physics feels harder than it should
Most students treat physics as a memory subject: collect a list of equations, match each one to a question type, and hope the exam plays fair. It rarely does. Good physics exams deliberately wrap a familiar principle in an unfamiliar situation, so the formula-matcher who never understood why F = ma works is left with no idea which equation to even pick.
Physics is fundamentally about a small number of deep principles — conservation of energy and momentum, Newton’s laws, the field concept — applied flexibly. Study it as a list of formulas and every new problem looks alien. Study it as a handful of principles and most problems become variations on a theme you already understand.
The core principle. In physics, understand the concept before you touch the equation. The maths is the last step, not the first.
The core method: concept, diagram, equation, check
For every problem, train yourself to follow the same four-stage routine:
- Concept. What physics is happening here? Name the principle in plain words before writing anything: “this is conservation of momentum”, “this is an object in equilibrium”.
- Diagram. Draw the situation. Mark every force, velocity, axis, and known and unknown quantity. For mechanics this means a proper free-body diagram.
- Equation. Now choose the equation that expresses that principle, and only now substitute numbers.
- Check. Run dimensional analysis — do the units work out? Is the magnitude sensible? Would the direction make physical sense?
Most wrong answers come from skipping straight to step three. Forcing yourself through concept and diagram first is the biggest single upgrade you can make to your physics.
Build intuition, then attach the maths
To genuinely understand a topic, use the Feynman technique: explain it out loud as if teaching a friend. Why does a heavier object not fall faster in a vacuum? Why does a satellite stay in orbit? If your explanation stalls or drifts into hand-waving, you’ve found a gap that no amount of equation-memorising would have revealed.
Connect equations to the physical world. v = u + at isn’t a string of symbols — it says velocity grows steadily when acceleration is constant. Once you can narrate what an equation does, you stop misapplying it.
A concrete weekly routine
- 3–4 sessions of 50–60 minutes across the week, spaced out.
- Begin each session with a 5-minute warm-up: redo one problem from last week’s error log, closed-book.
- Spend the core of the session on new problems solved from a blank page, always starting with concept and diagram.
- Interleave topics once you’ve met them — mix a mechanics problem with an electricity one — so you rehearse choosing the right principle.
- Close with 5 minutes of error logging.
Technique by technique
| Technique | What it means in physics | When to use it |
|---|---|---|
| Concept-first routine | Name the principle before the equation | Every single problem |
| Free-body diagrams | Draw and label all forces and axes | Mechanics, equilibrium, dynamics |
| Dimensional analysis | Check units balance on both sides | After every derivation, before numbers |
| Closed-book problem redo | Re-solve a worked example unaided | Each new topic |
| Interleaving | Mix topics in one session | After learning several topics |
| Feynman technique | Explain a concept aloud, plainly | When you suspect shallow understanding |
| Past papers | Timed full papers, self-marked | 3–4 weeks before the exam |
Common mistakes — and how to fix them
| Mistake | Why it hurts | The fix |
|---|---|---|
| Grabbing an equation first | You apply the wrong principle | Name the concept and draw it first |
| Skipping the diagram | Setup errors and missed forces | Always draw a labelled diagram |
| Ignoring units | Plausible-looking but wrong answers | Run dimensional analysis every time |
| Memorising without understanding | Fails on novel scenarios | Use Feynman to test real understanding |
| Plugging numbers in too early | Algebra slips, no sanity check | Solve symbolically, substitute last |
| Re-reading instead of solving | Recognition, not problem-solving skill | Redo problems closed-book |
How to revise before the exam
Three to four weeks out, switch to full past papers under timed, exam-like conditions — proper time limit, formula sheet only if the exam allows one, no phone. Mark your own work against the scheme, and notice how marks are awarded: often for the diagram, the correct principle and the method, even when the final number is wrong. That tells you to always show your reasoning.
Then sort every lost mark into a category in your error log:
- Conceptual — you applied the wrong physics.
- Setup — wrong diagram, missed a force, wrong sign.
- Algebra — the physics was right, the maths slipped.
- Units / arithmetic — a dimensional or numerical slip.
After a few papers a pattern emerges. If most of your losses are algebra, your physics is fine and you need cleaner working; if they’re conceptual, go back and re-understand the principle. Target the biggest category first.
A starter checklist
- On your next problem, write the principle in words before any equation.
- Draw a labelled diagram for every mechanics question this week.
- Check the units on every answer you produce.
- Start an error log sorted into concept / setup / algebra / units.
- Schedule three spaced sessions, each opening with an old problem.
- Three to four weeks before any exam, switch to timed past papers.
Physics rewards the student who thinks before calculating. Get the concept and the diagram right, and the equation almost picks itself. Build that routine until it’s automatic, and unfamiliar exam questions stop being frightening — they’re just your four-step method applied to a new picture.
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