How to Build Physics Problem-Solving Skills

Problem-solving in Physics is a skill, not a talent. Like any skill, it improves with structured practice.

The 4-step problem-solving framework

Step 1: Understand the problem

Read the question twice. On the second read, identify:

• What physical situation is described? (A falling object, a circuit, a wave, a thermal process.)
• What are you asked to find?
• What information is given? (Write down the known values with units.)
• What is the relevant physics topic?

Step 2: Plan your approach

• Which equation or principle applies?
• Do you need to convert any units?
• Is this a one-step or multi-step problem?
• Do you need to draw a diagram?

Step 3: Execute

• Write the equation.
• Substitute the values with units.
• Solve step by step.
• State the answer with the correct unit.

Step 4: Check

• Does the answer have the right unit?
• Is the magnitude reasonable?
• Does it answer the question that was asked?

Common problem types in IGCSE Physics

Type 1: Direct calculation

Given values, use one equation. Example: “Calculate the force. Mass = 5 kg, acceleration = 3 m/s^2.” Strategy: Identify the equation, substitute, solve.

Type 2: Multi-step calculation

Need two or more equations. Example: “A 2 kg ball falls 5 m. What is its speed when it hits the ground?” Strategy: GPE = mgh gives the energy. KE = 0.5mv^2 lets you solve for speed. The link is that GPE converts to KE.

Type 3: Graph-based problems

Extract values from a graph, then calculate. Example: “Using the V-I graph, find the resistance.” Strategy: Read two points from the graph. Calculate gradient or use V = IR.

Type 4: Conceptual explanation

“Explain why…” or “Describe what happens when…” Strategy: Identify the physics principle. State it. Apply it to the specific situation. State the consequence.

Type 5: Evaluation

“Suggest one improvement…” or “Explain why the value differs from the accepted value.” Strategy: Think about sources of error, assumptions made, or ways to increase precision.

Building problem-solving fluency

Stage 1: Guided practice (1 to 2 weeks)

Work through solved examples step by step. After reading the solution, cover it and try to reproduce it. If you get stuck, peek at the step you are on, then continue independently.

Stage 2: Supported practice (2 to 4 weeks)

Attempt problems independently but with your notes and equation sheet available. Focus on the problem-solving process (identifying the right approach) rather than memorising equations.

Stage 3: Independent practice (ongoing)

Attempt problems without any resources, under timed conditions. This is exam simulation and is the final stage of preparation.

The habit that makes the difference

When stuck, do not stare at the problem. Do something:

• Write down what you know.
• Write down what you need to find.
• Write down any equations that might be relevant.
• Draw a diagram.

Action breaks the “stuck” feeling and often reveals the next step.