Year 10 physics: get units and estimates ready for September

If your child has just finished Year 10, August does not need to become an early revision season. However, one small physics habit can be worth practising before September: checking what a measurement actually means.

A pupil might choose the correct equation but substitute a distance in centimetres when the calculation requires metres. Another might produce a calculator answer without noticing that it suggests a person walks faster than a car travels. These are useful things to practise without tackling whole exam papers.

This retrospective guide uses 10 August 2026 as its seasonal topic date. The plan below fits into three short sessions across a holiday week, with plenty of space left for rest.

1. Build a small conversion card

Start with four conversions from topics your child has already studied. For example:

• 100 centimetres equals 1 metre.
• 1,000 metres equals 1 kilometre.
• 1,000 grams equals 1 kilogram.
• 60 seconds equals 1 minute.

Ask your child to explain each conversion aloud, then try one example without looking at the card. Convert 250 centimetres into metres, 0.6 kilometres into metres, 750 grams into kilograms and 2.5 minutes into seconds.

The answers are 2.5 metres, 600 metres, 0.75 kilograms and 150 seconds. If one goes wrong, draw the relationship rather than immediately adding more questions. For instance, 750 grams is less than one kilogram, so an answer of 750,000 kilograms cannot fit.

Keep the card limited to conversions that are currently useful. Add unfamiliar prefixes only when they appear in school materials.

2. Estimate before reaching for a calculator

Use an ordinary situation to make the numbers meaningful. Ask: roughly how long might it take to walk 100 metres?

Suppose your child estimates 80 seconds. Distance divided by time gives an average speed of 1.25 metres per second. The point is not to establish one exact walking speed, but to connect the answer with something they can imagine.

Next, compare that with a suggested answer of 125 metres per second. Ask what would have to be different for that answer to make sense.

If you measure an actual walk, choose a safe route away from traffic. Record the distance and time with their units. Discuss why an estimate and a measured result might differ: pace, distance accuracy and stopwatch reaction time can all matter.

3. Write units into every calculation

Choose three short questions from previous classwork or suitable GCSE practice materials. Use topics already taught rather than trying to cover September content early.

For each question, follow the same sequence:

1. Write down the quantities given, including their units.
2. Convert any units required by the equation.
3. Substitute the numbers and calculate.
4. State the answer with its unit.
5. Check whether the size of the answer seems reasonable.

For example, a cyclist covers 600 metres in 2 minutes. Convert the time to 120 seconds before calculating an average speed of 5 metres per second.

If the answer is wrong, identify the exact step that caused trouble. Correct that step before attempting another question.

4. Finish with a September reminder

End the week by asking your child to complete this sentence: “Before I calculate, I will check…” Keep their answer specific, such as “whether the time needs converting into seconds”.

Save one correctly worked example beside that reminder. This gives them a useful starting point when lessons resume, without creating a holiday workbook.

If conversions still feel confusing, focused one to one support can help identify the sticking point. Take the free 2 minute quiz to explore support with GoodGrade Tutors, online across the UK and in person in selected areas.