A-Level Physics: A Problem-Solving Framework That Actually Works
A-Level Physics problems can feel overwhelming. You read the question, see a wall of text with unfamiliar context, and freeze. This happens even to students who understand the physics โ because understanding concepts and solving exam problems are different skills.
Here's the 5-step framework our tutors use to break down any A-Level physics problem.
The SOLVE Framework
S โ Sketch the Situation
Before writing any equations, draw a diagram. This single step eliminates more errors than any other technique.
- For mechanics: draw free body diagrams with all forces labelled
- For circuits: redraw the circuit clearly with current directions
- For waves: sketch the wave pattern with wavelength and amplitude marked
- For fields: draw field lines with direction and relative strength
Rule of thumb: If you can't draw it, you don't understand the question yet.
List every piece of information the question provides, converting units as needed:
Given:
m = 2.5 kg
u = 0 m/s (starts from rest)
a = 3.2 m/sยฒ
t = 4.0 s
Find: s (displacement)
This step catches unit errors (e.g., km vs m, minutes vs seconds) before they propagate through your calculation.
L โ Link to Physics Principles
Identify which physics principles apply. Ask yourself:
- Is this a conservation problem? (energy, momentum)
- Is this a Newton's law problem? (F = ma)
- Is this a field problem? (E = F/q, B = F/qv)
- Is this a wave problem? (v = fฮป, diffraction, interference)
Write down the relevant equations before plugging in numbers.
V โ Verify with Estimation
Before doing the full calculation, estimate the answer:
- Should the answer be big or small?
- Positive or negative?
- What order of magnitude?
This catches calculator errors. If you estimate "a few metres" and your calculation gives 3000 m, something went wrong.
E โ Execute and Evaluate
Now do the calculation. After getting your answer:
- Check the units (dimensional analysis)
- Check the sign (does the direction make sense?)
- Check the magnitude (is this physically reasonable?)
- Re-read the question (did you answer what was actually asked?)
Example: Projectile Motion Problem
Question: A ball is thrown horizontally from a cliff 45 m high at 12 m/s. Find the distance from the base of the cliff where it lands.
S โ Sketch: [Draw cliff, horizontal velocity arrow, curved trajectory, vertical height]
O โ Organize:
Horizontal: ux = 12 m/s, ax = 0
Vertical: uy = 0 m/s, ay = 9.81 m/sยฒ, sy = 45 m
Find: sx (horizontal distance)
L โ Link: This is a projectile motion problem. Horizontal and vertical motions are independent. Use suvat equations.
V โ Verify: Falling 45 m takes roughly 3 seconds (s = ยฝgtยฒ). At 12 m/s horizontal, that's roughly 36 m. Expect an answer around 36 m.
E โ Execute:
- Vertical: 45 = 0 + ยฝ(9.81)tยฒ โ t = โ(90/9.81) = 3.03 s
- Horizontal: sx = 12 ร 3.03 = 36.3 m โ
The answer (36.3 m) matches our estimate. Units are correct (metres). The answer is physically reasonable.
When the Framework Saves You
The SOLVE framework is most valuable for multi-step problems and unfamiliar contexts. A-Level examiners love disguising standard physics in novel scenarios:
- A bungee jumper (energy conservation + Hooke's law)
- A satellite in orbit (circular motion + gravitational fields)
- A medical ultrasound (wave properties + Doppler effect)
The physics is always the same. The framework helps you see through the disguise.
Common A-Level Physics Exam Mistakes
- Not drawing diagrams โ Loses easy marks and increases error rate
- Wrong units โ Always convert to SI before calculating
- Ignoring significant figures โ Match the precision of given data (usually 2-3 s.f.)
- Forgetting direction โ Velocity, force, and field strength are vectors
- Not re-reading the question โ Many students answer a different question than what was asked