Year 7 science: practise planning fair tests this summer
With the summer break approaching or already under way, depending on your school, Year 7 science practice can be small and practical. Planning one simple investigation gives pupils a chance to connect classroom vocabulary with something they can actually observe.
The aim is not to fill the holidays with experiments. It is to help your child explain what they would change, measure and keep the same, then recognise what their results can and cannot show. Try one short planning session and, if they are interested, carry out the test another day.
1. Start with a question you can measure
Use a question such as: “Does the surface an ice cube rests on affect how quickly it melts?” Compare a metal tray with a plastic plate, both left in the same room beforehand.
Ask your child to make a prediction and explain their reasoning. “The metal will melt the ice faster because it transfers energy to the ice more quickly” is more useful than a guess alone. A prediction does not need to match the eventual result to be worth discussing.
Keep the setup simple: use small ice cubes, washable surfaces and a timer. Put everything somewhere spills can be wiped up promptly, away from electrical equipment. There is no need for hot water or specialist equipment.
2. Name the variables before starting
Ask your child to finish three sentences:
- I will change the material beneath the ice cube.
- I will measure the time taken for the ice cube to melt completely.
- I will keep the ice cube size, starting conditions and room location as similar as possible.
Then attach the scientific terms. The independent variable is what they change. The dependent variable is what they measure. Control variables are the conditions they try to keep the same.
Challenge one detail: “Would it be fair to put a large cube on the metal and a small cube on the plastic?” Your child should explain how cube size could affect melting time, making it harder to identify the effect of the surface.
3. Write a method someone else could follow
Before starting, agree what “completely melted” means: no visible solid ice remains. This gives both surfaces the same finishing rule.
Have your child write numbered instructions, including when to start the timer and how often to check the cubes. Checking every 30 seconds is manageable, but means the recorded melting time is only approximate. That limitation is worth noticing.
Prepare a results table with columns for surface material and melting time in seconds. If time allows, repeat each condition three times using fresh, similar cubes and surfaces returned to room temperature. Calculate the mean for each surface by adding its times and dividing by three.
4. Explain the result without overstating it
Use this sentence frame: “In our test, ice melted faster on ___, with a mean time of ___ seconds compared with ___ seconds.”
Next, ask what could weaken that conclusion. The plate and tray may differ in thickness or shape as well as material. Cubes may not be identical. A useful improvement addresses a specific problem rather than simply saying “be more accurate”.
Finish by asking your child to explain the three types of variable without looking at their plan. Stop there: one clear explanation is enough for today.
If planning investigations remains confusing, GoodGrade Tutors offers one to one support online across the UK, plus in person in selected areas. Take the free 2 minute quiz to explore support suited to your child.