A Yew Tee parent choosing Primary 4 Science tuition may find two perfectly reasonable options: a weekday that keeps the topic close to school lessons, or a weekend that offers a quieter start. The useful choice depends on what your child needs to do with the time.
Shadow questions show why that matters. A child may remember ‘nearer means bigger’ but be unable to say what is nearer to what. Once the picture changes, the rule becomes unreliable. The next learning step is to follow the positions of the light source, object and screen, then explain the comparison precisely.
This guide uses a simple shadow setup to compare weekday and weekend 3-pax tuition routines. The examples are illustrative, not a fixed Primary 4 topic sequence. Match them to actual schoolwork and readiness, and confirm the real teaching location and available sessions when planning from Yew Tee.
eduKateSG · Primary 4 Science · Yew Tee families
Choose a routine that supports clear thinking
Start with the route closest to your child’s situation, or use the complete chapter index.
ROUTE 1 · Chapters 1–2
Hear the starting explanation
Locate the learning need and consider a weekday transition.
ROUTE 2 · Chapters 3–4
Connect the lesson with recall
Plan a weekend return and follow the worked example.
ROUTE 3 · Chapters 5–6
Check the conditions
Look more closely at evidence and 3-pax discussion.
ROUTE 4 · Chapters 7–8
Try and review
Use an independent question and review progress.
ROUTE 5 · Chapters 9–10
Choose the next step
Read parent questions and find programme information.
Full chapter index · Independent check · Primary 4 Science programme
Full chapter index
Chapters 1–5: learning needs, timing and examples
Chapters 6–10: group learning, checks and next steps
CHAPTER 1 OF 10 · Hear the starting explanation
1. Ask what the child’s rule leaves out
Begin with one shadow question your child has already attempted. Ask them to point out the light source, the object blocking the light and the surface where the shadow forms. Before discussing size, make sure those three parts are clear. A memorised answer can conceal uncertainty about the setup itself.
If the child says ‘move it nearer’, ask which item moves and which item it moves towards. This is not a request for a more elaborate sentence. It is the information needed to know what physical change the child means. The explanation should match the actual diagram.
Keep the first response. A tutor can use it to distinguish a vocabulary issue from a spatial-reasoning difficulty or an overlooked condition. That is more useful than arriving with only the corrected answer, where the child’s original interpretation has disappeared.
CHAPTER 2 OF 10 · Hear the starting explanation
2. Use a weekday for one careful comparison
A weekday lesson can work well when a school diagram is still familiar and the child can ask about the exact detail that caused difficulty. The teaching aim might be modest: compare two positions while keeping the other parts of the setup fixed, then describe what changed.
Consider how your child arrives at that task. A hurried journey, missed meal or long sequence of activities can make it harder to inspect a diagram carefully. For a Yew Tee household, compare the whole afternoon and evening, including the return journey and the ordinary end of the day.
Ask the tutor how much new reasoning is expected after the lesson at home. A short later check can be helpful. A second lengthy explanation session may mean that the lesson goal, workload or timing needs review. The routine should make the learning clearer without consuming every available quiet moment.
CHAPTER 3 OF 10 · Connect the lesson with recall
3. Use weekend space without losing the idea by midweek
A weekend may give the tutor more room to draw, compare and discuss the same setup from different descriptions. Your child can predict a change and then explain why it follows from the positions shown. That is useful time if each pupil participates in the reasoning.
Give the lesson one small connection to the following week. Ask your child to describe the three parts of the setup and explain what happens when only the object moves. Use a fresh description, so that the child must reconstruct the relationship rather than remember where an answer appeared on a page.
Leave enough room around the session for the child to arrive ready. A weekend with several lessons may offer less attention than a settled weekday. The decision is about the child’s actual learning conditions, not the name of the day.
| Routine option | Teaching opportunity | Useful later check |
|---|---|---|
| Weekday close to schoolwork | Resolve one confusing diagram | Describe the setup without the model answer |
| Weekend with a calm start | Compare movements and sketch the relationship | Predict the reverse movement during the week |
| Either day with rushed answers | Slow down the identification of the three parts | Name what moves and what stays fixed |
CHAPTER 4 OF 10 · Connect the lesson with recall
4. Explain shadow size with the positions made explicit
Consider a small light source, an opaque object and a screen arranged in a straight line, with the object between the source and screen. Keep the light source and screen fixed. When the object moves closer to the light source, its shadow on the screen becomes larger in this setup.
Light travels in straight lines. Lines drawn from the small source past the object’s edges spread farther apart by the time they reach the screen when the object is nearer the source. The blocked region on the screen is therefore larger. A simple edge-ray drawing can make that relationship visible.
Move the object towards the screen instead, while keeping it between the fixed source and screen. Its shadow becomes smaller in the same idealised setup. The explanation depends on those stated conditions. ‘Nearer makes it bigger’ leaves out the very relationship the question is testing.
CHAPTER 5 OF 10 · Check the conditions
5. Check what stayed fixed before reusing a rule
Suppose a second diagram moves both the object and the screen. You cannot safely reuse the previous comparison just because the object is nearer the source. The relative distances now need to be considered together. A primary-level question may provide a drawing or measurements that make the required comparison clear.
For a fair test of the effect of object position, use the same light source, object and screen, keep the source and screen positions fixed, and change the object’s position between them. Keep the object’s orientation consistent. Otherwise a different apparent width or another changed condition may affect the result.
Real light sources also have size, so some shadows have blurred edges. The worked example uses a small source to keep the comparison clear. Follow the setup supplied in the child’s question rather than treating every household lighting arrangement as identical.
CHAPTER 6 OF 10 · Check the conditions
6. Use a 3-pax lesson to hear three complete explanations
A small group can make it easier to see where each learner’s explanation stops. Ask how the tutor checks that every child can identify the fixed parts, describe the movement and predict the result. One confident answer from the group does not establish that all three pupils understand.
Each child could sketch the starting setup and mark the one item that moves. They can then write a sentence beginning with that change: ‘When the object moves closer to the light source, while the screen stays fixed…’ This makes the conditions part of the explanation instead of an afterthought.
The tutor can finish with a fresh comparison that reverses the movement. A pupil who understands should adapt the explanation. A pupil who has only remembered ‘bigger’ may need more work with the diagram. Ask for feedback that identifies that difference.
CHAPTER 7 OF 10 · Try and review
7. Try a shadow check with no pointing from an adult
Let your child attempt the check below without anyone indicating the relevant distance. A pointing finger can supply the very piece of interpretation you wanted to assess. The child may draw a sketch if that helps; the sketch is a tool for reasoning, not an extra presentation requirement.
If the answer is correct but the explanation is vague, ask which two items were fixed. If the prediction is wrong, return to the starting arrangement and trace the edges of the blocked region. Keep the supported explanation separate from the first independent attempt.
There is no need to create a dark-room experiment at home. The scenario supplies the conditions. The useful evidence is whether your child can keep track of what moves and explain the size change consistently.
Independent check
A small light source and a screen stay fixed. An opaque card is between them. The card is moved closer to the screen while remaining between the source and screen, with the same orientation. Does its shadow on the screen become larger or smaller? Name the conditions that make this comparison clear.
Checking notes
The shadow becomes smaller in the stated setup. The source and screen are fixed; the same opaque card moves towards the screen with its orientation unchanged. A complete answer identifies that movement rather than saying only ‘nearer’.
Over a few ordinary lessons, look for increasingly precise references. Does your child say ‘the object moves towards the screen’ instead of ‘it goes nearer’? Can they distinguish the object from its shadow? Can they identify which parts must stay fixed for the comparison to be meaningful?
Those improvements matter even before every written answer is concise. Help the child keep the explanation complete, then work on expressing it efficiently. Removing necessary conditions to make a sentence shorter can bring back the original confusion.
Review the practical routine too. If the child can think clearly in the lesson but never has a manageable moment for a later check, simplify the follow-up. If they repeatedly arrive drained, discuss a different transition or session option before concluding that more practice is the only solution.
| Starting response | Useful improvement | What to ask next |
|---|---|---|
| Nearer makes it bigger | Names object and light source | What stays fixed? |
| Changes several parts in a proposed test | Changes object position only | Why keep the screen in place? |
| Predicts correctly with a new setup | Uses the stated conditions | Can the explanation be written clearly? |
Is a bigger object always responsible for a bigger shadow? Shadow size also depends on the arrangement of source, object and screen. In the worked comparison the object stays the same size; changing its position changes the shadow on the fixed screen.
Must my child draw light rays in every answer? Follow the question’s requirements. A sketch can help the child reason, but a written answer may be enough when a drawing is not requested. The explanation still needs to identify the relevant movement and conditions.
Is weekend tuition better for visual topics? A weekend can provide useful space, but a focused weekday lesson can also support careful diagram work. Compare the child’s readiness and the lesson structure, rather than assigning a topic to a particular day.
CHAPTER 10 OF 10 · Choose the next step
10. Choose a routine that supports a more precise explanation
Bring the original school diagram and your child’s first answer to the tuition discussion. Ask how the tutor would help them track the positions and transfer the idea to a changed setup. This makes the learning aim visible from the start.
Discuss the 3-pax group’s fit, the expected follow-up and how independent progress will be checked. Then confirm the actual location and available weekday or weekend sessions. Include all the surrounding travel and family commitments in the decision.
A useful first aim is simple: your child can describe what moves, state what stays fixed and explain the resulting comparison. When that becomes possible without prompting, the timetable is supporting clearer Science thinking.
Explore the Primary 4 Science programme · Read the Yew Tee education and tuition guide
Read the Science weekday-versus-weekend learning-rhythm guide · Visit eduKate Singapore for consultation information