Friction can slow a sliding object, yet it also helps us grip things. For families exploring schools in Sembawang, a useful first step is to stop treating friction as always unwanted and ask which surfaces interact and what the task requires.
Sembawang Primary School’s Science page highlights everyday applications, questioning, data analysis and evidence-based reasoning. The paper-based examples here are independent eduKateSG activities, not results from a school experiment or a recommendation to test slippery surfaces.
Keep the discussion to drawings and ordinary observations. There is no need to run, create a slippery floor or modify shoes. A clear explanation can be developed without staging a risky demonstration.
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Contents
Explore, practise and connect · Four chapters
CHAPTER 1 OF 4
1. Name the two surfaces
Imagine a book sliding to the right across a level table after a push has ended. Friction from the table acts on the book towards the left, opposing its sliding motion relative to the table.
Name both surfaces: the book’s underside and the tabletop. Saying “there is friction” is a start, but identifying the contact makes the explanation more precise. Friction is an interaction, not a substance stored inside the book.
In this simple example, friction contributes to slowing the book. We are not claiming that every moving object has friction pointing opposite its overall motion in every situation; the contact and relative sliding, or tendency to slide, matter.
CHAPTER 2 OF 4
2. Explain when friction helps
When a hand grips a book, friction between the hand and cover can help prevent the book slipping. Here reducing friction would not necessarily improve the task because the aim is to hold the object securely.
Walking also relies on contact forces between shoes and the ground. Friction can help prevent slipping during an ordinary step. That does not mean any shoe or surface guarantees safety; conditions such as water and surface contamination matter.
Compare holding a book with sliding a box along a surface. Ask whether resisting slipping is helpful in each task. The answer depends on the purpose, so “friction is bad” and “more friction is always better” are both too broad.
CHAPTER 3 OF 4
3. Avoid judging by roughness alone
At a simple classroom level, rougher surfaces often provide more resistance to sliding than smoother ones under comparable conditions. However, appearance alone is not a reliable way to rank every pair of materials.
Friction depends on the surfaces in contact and the conditions, including how strongly they are pressed together. A result from one pair of surfaces should not become a universal claim about all rough and smooth materials.
Use two fictional cards: A says “the object slid a shorter distance”; B says “the surface looked rough”. Card A describes a movement result and B describes appearance. Neither alone proves a complete causal explanation without knowing how the comparison was made.
CHAPTER 4 OF 4
4. Plan a fair comparison on paper
Imagine comparing how far the same block slides on two level surfaces after receiving the same starting speed. Keep the block, its orientation and the measurement method the same, and change the surface being investigated.
Under those controlled conditions, a shorter stopping distance can support an explanation involving greater resistance. Simply giving two hand pushes is less reliable because the initial speeds may differ. Do not claim that the surface alone caused a difference without considering this.
Finish with three statements: the surfaces involved, whether friction helps the intended task, and what evidence would support a comparison. Leave the practical investigation to an appropriate supervised classroom setup. At home, the success is a careful plan with its assumptions clearly stated.
Sources and scope
School information checked on 17 October 2026 (Singapore time): Sembawang Primary School: Science. Programmes may change. Family activities are independently written by eduKateSG, not official school tasks. This article does not imply school endorsement, rank schools or guarantee admission or learning results.
For more local learning connections, explore the neighbourhood school and family learning guide.