Science in Punggol study guide · Article 0001 of 20
A useful science question tells us what to investigate and what evidence to collect. Start with something you notice, then make the question small enough to answer through observation, measurement or reliable reading.
A wet pavement, a moving shadow or a plant near a window can start a science discussion. Asking “Why?” is valuable. The next step is to decide how to look for an answer.
On this page: Begin with an observation · Make the question specific · Predict, then check · Worked question
Begin with an observation
Describe what happened before deciding why. “The cloth near the fan dried first” is an observation. “Fans always make water evaporate faster” is a wider claim that needs more evidence and clear conditions.
On a walk around Punggol, you might notice puddles remaining in some places after others have dried. Look for details: which places receive sunlight, what are the surfaces like, and is the air moving? Each detail suggests something worth investigating.
Several conditions may change together outdoors. A sunny patch might also have a different surface or receive more wind. Noticing these differences prevents a quick guess from becoming an unsupported conclusion.
Make the question specific
A focused question identifies a condition to compare and an outcome to record. Instead of “Why do things dry?”, ask “How does moving air affect the time a wet cloth takes to dry?” The second question points towards a possible comparison.
Words such as “good” and “better” need a clear meaning. If you are choosing a material, first name its job. Does it need to keep water out, bend without breaking, or let light pass through? The job helps you choose what to measure.
Choose a question that fits the available time and equipment. Comparing the water absorbed by equal pieces of kitchen paper is manageable at home. Understanding a neighbourhood’s whole water supply needs other information and methods.
Not every question needs an experiment. Diagrams, reliable reading and observations collected over time can also provide evidence. Choose the method that suits the question.
Predict, then check
A prediction says what you expect. Its reason should use a science idea: “I predict the cloth exposed to moving air will dry sooner because moving air can help water evaporate.”
A prediction is not a conclusion. Record what happens even if it differs from your expectation. An unexpected result may reveal a useful pattern or a problem with the method.
Before investigating, decide what will count as an outcome. For wet cloths, “dry” needs a consistent rule. Decide how you will judge both cloths, rather than using a different rule when the result is inconvenient.
Worked question
Question: Which question is most suitable for a comparison investigation: “Which wet cloth is nicer?”, “Why is drying important?”, or “How does moving air affect drying time when two cloths start equally wet?” Explain your choice.
Worked explanation: The third question is most suitable. It identifies the condition to change, exposure to moving air, and the outcome to measure, drying time. Starting equally wet helps make the comparison meaningful. The cloths should also have the same size and material, and other relevant conditions should be kept the same.
Common mistake: A successful investigation does not have to prove the first prediction correct. Its purpose is to answer the question using evidence. Write the observation, question and prediction separately so that each has a clear role.
