Why GCSE Physics Calculations Matter
Calculation questions appear in every GCSE Physics paper and are often worth 2–4 marks each. Many students avoid them — which means those who practise them regularly gain a significant advantage.
The good news is that GCSE Physics calculations are very learnable. There are a fixed set of equations you need to know, and with enough practice, they become second nature.
Here are the 10 most important calculations to master.
1. Speed, Distance and Time
speed = distance ÷ time (v = d/t)
Used in forces and motion topics. Watch out for unit conversions — make sure distance is in metres and time is in seconds for SI units.
2. Acceleration
acceleration = change in velocity ÷ time (a = Δv/t)
Also written as a = (v−u)/t. You need to be comfortable rearranging this for v, u, or t.
3. Force (Newton's Second Law)
force = mass × acceleration (F = ma)
One of the most commonly tested equations. Always check units: force in Newtons (N), mass in kg, acceleration in m/s².
4. Weight
weight = mass × gravitational field strength (W = mg)
On Earth, g = 9.8 N/kg (sometimes rounded to 10 N/kg in exams — check your paper).
5. Kinetic Energy
kinetic energy = ½ × mass × velocity² (KE = ½mv²)
Don't forget to square the velocity before multiplying. A common mistake is squaring the whole expression.
6. Gravitational Potential Energy
GPE = mass × gravitational field strength × height (GPE = mgh)
Often combined with kinetic energy questions — e.g. an object falling from a height converts GPE to KE.
7. Power
power = energy transferred ÷ time (P = E/t)
Also P = W/t (work done ÷ time). Power is measured in Watts (W).
8. Specific Heat Capacity
energy = mass × specific heat capacity × temperature change (E = mcΔT)
This is also a required practical topic. Make sure you know the units: energy in J, mass in kg, SHC in J/kg°C.
9. Resistance (Ohm's Law)
voltage = current × resistance (V = IR)
You need to be able to rearrange for I and R as well. This links to the IV characteristics required practical.
10. Wave Speed
wave speed = frequency × wavelength (v = fλ)
Used in the waves topic. Frequency is in Hz, wavelength in metres, wave speed in m/s.
How to Practise These Calculations
The key is to practise each equation in isolation first — getting confident with rearranging and substituting values — before moving on to multi-step problems.
Our GCSE Physics calculations worksheets cover every equation above with 20–30 graded practice questions and full mark schemes. They're available individually or as a complete Physics bundle.
Aim to work through at least one calculation worksheet per week — by the time exams come around, these will feel routine.
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