The Wonderful World of Science · Lesson 2 of 3
Investigating Like a Scientist
“Follow everyday questions through possible explanations, careful tests, and evidence-based conclusions.”
• Distinguish an observation, a question, and a possible explanation. • Describe how observations or experiments can test an explanation. • Use results to decide whether to keep investigating or revise an idea. • Apply scientific thinking to everyday problems. • Plan a safe investigation and explain how working with others can help.
When a pen stops writing
Imagine that your pen stops writing halfway through a sentence. You could throw it aside, or you could try to find out what happened. The second choice gives you a small but complete opportunity to investigate. You start with an observation, ask a question, and consider an explanation that can be checked.
The observation is that the pen no longer leaves a line on the paper. The question is why it stopped writing. One possible answer is that the ink has run out. This is a guess that has a reason behind it: a pen needs ink to write. But the guess is not yet something you have established.
Problem
Your pen stops writing. How can you investigate whether the ink has run out?
- 1.Observe the problem: the pen is not leaving a line on the paper.
- 2.Ask why this has happened, and suggest that the refill may be empty.
- 3.If the pen can be opened safely, inspect the refill. An empty refill supports your suggested answer.
- 4.If you can see ink remaining, the empty-refill idea does not explain what you found. Consider another possibility, such as dried ink or a blocked tip, and decide on another safe check.
- 5.Describe what the check actually showed. Seeing ink remaining rules out an empty refill, but does not by itself establish which other cause is responsible.
Suppose ink remains in the refill. It would be unreasonable to keep saying that it is empty. A new possible explanation is that some ink has dried and is not flowing as expected. An appropriate check may help investigate that idea. The important change is in your reasoning: you allow the observation to guide what you try next.
Following a question step by step
This everyday investigation illustrates the scientific method: a way of seeking answers through questions and evidence. It is helpful to describe the steps in order when learning the process. In real work, a result can send you back to an earlier step, so investigation is not always a single journey ending with the first test.
Something noticed or recorded about an object, event, or situation. An observation describes what was found rather than assuming why it happened.
An idea that might explain an observation and can be checked using evidence. It is sometimes called a hypothesis.
Observations or results used to judge whether an explanation is supported.
Begin by noticing something interesting or puzzling. Turn it into a question you can work on. Suggest a possible answer, then choose observations or an experiment that can check it. Finally, analyse the result: think carefully about what happened and whether it answers the question. Analysing does not mean merely announcing success; it includes noticing when an idea is not supported.
A test does not always need elaborate apparatus. Looking inside a refill is a further observation. An experiment involves deliberately trying something and observing what happens. Either approach should be chosen because its result is relevant to the possible explanation, rather than simply because it is entertaining.
A reasonable guess tells you what to investigate. It does not become a conclusion just because you repeat it. Use the results to decide what is supported, and state what you still do not know.
Look back at a problem you solved
You have probably used parts of this process without naming them. Reflecting on a past problem helps you recognise the difference between trying things at random and checking an idea. Choose a safe situation that you remember clearly enough to describe the steps.
Write about a problem you tried to solve. Describe what you noticed, what question you asked, the possible answer you considered, the check you made, and what you learned. If you tried another idea, explain which observation led you to it.
Problem
You cannot find your notebook in your school bag. How might you check an explanation?
- 1.Observation: the notebook is not in the part of the bag you checked.
- 2.Question: where is it? Possible answer: it may be on the desk where you last used it.
- 3.Check that desk rather than immediately deciding that someone took it.
- 4.If the notebook is there, the check supports your idea about its location. If it is not, recall another place you used it and check that possibility.
- 5.Your search becomes more useful when each step follows a reason and each result informs the next step.
Scientific thinking in everyday work
People use this kind of reasoning in many occupations and household situations. A cook, a bicycle repair person, and an electrician may all notice a problem, suggest a cause, and check it. Their tools differ, but the relationship between a question and the evidence remains important.
A cook may notice that dal has spilled from a cooker and wonder whether too much water was added. That is a possible explanation, not an automatic conclusion. The cook can think about the quantity used and compare it with an appropriate amount on another occasion. A child should discuss this example with an adult rather than handle a hot or pressurised cooker.
Problem
A bicycle tyre becomes flat. What can a repair person investigate?
- 1.Observation: the tyre has lost air. Question: where is the air escaping?
- 2.Possible explanation: there is a small hole in the inner tube.
- 3.A repair person may inflate the removed tube and check it in water. Bubbles repeatedly emerging at one spot show that air is escaping there.
- 4.That observation supports a leak at that location. If this check shows no leak, the repair person needs to consider another cause rather than invent a hole.
- 5.The useful connection is between the proposed cause, the chosen check, and what the bubbles indicate.
An electrician faced with a light that does not work may consider a faulty bulb or a faulty switch. These are different possible explanations. A trained adult chooses appropriate checks to distinguish them. You can understand the reasoning without carrying out electrical tests yourself. Observing a problem does not make every investigation safe for a child to perform.
Describe a daily life situation in which someone checked a possible explanation. Identify the observation, question, proposed cause, check, and result. You may interview a family member about a safe example. Do not invent a result if you did not observe it or learn what happened.
Ask your own why question
Curiosity becomes more useful when you decide how you could seek an answer. Choose something you can observe safely, then make the question specific enough to investigate. A broad question may need to be divided into smaller questions before a simple observation can help.
Problem
You wonder why a flower sometimes looks closed. How can you begin without assuming the answer?
- 1.Write a narrower question: At what times does this flower appear open or closed?
- 2.Record its appearance at selected times for several days without plucking it or disturbing it.
- 3.Keep the records for the same flower separate from observations of other flowers, so you know what you compared.
- 4.Look for a repeated pattern. A pattern can suggest a further question, but it does not by itself establish the cause.
- 5.If the pattern varies, record that variation too. Do not remove observations just because they differ from your expectation.
Practice Problems
- Write a why question about something familiar that you can observe safely.
- State the observation that led you to the question.
- Suggest a possible explanation and explain why it is worth checking.
- Describe what you would observe or try, and what result would support or challenge your explanation.
- Explain what you would record and whom you could ask for help.
Discovering together
Science is often a shared activity. People can contribute different observations, ideas, and skills to the same investigation. Scientists around the world often work in teams, and you can begin practising collaboration when a question is difficult to answer alone.
One friend might notice a detail you missed, while another may suggest a different explanation. You can compare records, discuss why you disagree, and decide on a better check. Agreement alone is not evidence: a group still needs observations or results to support its conclusion. Sharing the work is useful when it improves the investigation, rather than simply making everyone repeat the same guess.
You will not answer every question immediately. Some need observations over a longer period; others need knowledge or tools you will learn about later. Keeping an unanswered question is reasonable. Continue observing, explain what you know so far, and remain willing to improve your understanding.
Quiz
A pen stops writing and you think its ink has run out. What is the best next step?
Your test does not support your possible explanation. What should you do?
What makes a check useful in an investigation?
Bubbles repeatedly emerge from one place on a bicycle tube checked in water. What is the most direct conclusion?
How can friends help investigate a question?
Which plan is appropriate for a child?
- Describe the pen investigation using observation, question, possible explanation, check, and conclusion. Include the case where ink remains.
- Write about a problem you solved. Which step gave you useful evidence, and which part was only a guess?
- Explain how the cooker, tyre, and light examples share a pattern of reasoning even though their checks differ.
- Give a daily life example of someone investigating a cause. State what evidence they would need before accepting it.
- Choose one safe why question and plan your first check. Explain what you would do if the result disagreed with your expectation.
- Two friends record different observations. How can they investigate the disagreement without deciding that one must be careless?
- Why is it useful to record an unexpected result instead of leaving it out?
Key Takeaways
• Observe, ask, suggest an explanation, test, and analyse the result. • A possible explanation needs evidence before it can support a conclusion. • An unexpected result can guide a new explanation or a better check. • Scientific thinking is useful in daily life as well as in professional research. • Choose safe investigations, keep honest records, and use collaboration to improve your reasoning.