Lesson 15

Lesson 16: The Advantages And Disadvantages Of Friction

Learning Objective

Analysing friction.

Syllabus Correlations

· Theme: Investigating force and energy.

· Learning Area: Force

· Learning Objective: Analysing friction

Learning Outcomes:

By the end of the lesson, pupils should be able to:

· state the advantages of friction;

· state the disadvantages of friction.

Concept(s) Introduced:

· friction has its advantages and disadvantages.

Skills Covered:

· Observing, classifying, making inferences, interpreting data, making conclusions, comparing and contrasting.

Vocabulary/ New Words:

· Extra force, cooling system, tyres, brake pads, excess friction, extra fuel, highway.

Value(s) Incorporated:

· Having an interest and curiosity towards the environment.

· Being diligent and persevering.

· Realising that science is a means to understand nature.

· Thinking rationally

· Analyse the things around us

· Identifying relevant contents associated with environment and everyday life experience

Materials Needed:

- oil, cup, eraser.

Point(s) to Note:

- Friction causes heat.

- Friction can be useful in many area of application.

- Friction causes wear and tear.

Teaching Strategies
Set Induction	Teacher plays the Introduction component. Teacher gives the situation of tyre worn out and engine produces heat. Recaps the effects of friction that causes damages to the things around us. View the video of riding motorcycle with a worn out tyre. It is not safe. Ask pupils why and what will happen. Encourage pupils to give the suggestion on how to prevent car overheat; suggest ways to overcome it. Guide pupils to recap the effects of friction. Help pupils to understand the advantages and disadvantages of friction. Ask pupils of their common sense on these two videos. Emphasise that we should be careful on our safety of our life. Component: Introduction
Step 1	Teacher plays the video clips about friction. Allow pupils to discuss and give some other examples of advantages of friction. Teacher recaps the concept of friction that opposes the movement of an object. It occurs when two surfaces rub against each other. Discuss the effects of friction that gives advantages in our daily life. Teacher gives the five examples in our daily life that highlight the advantages of friction. Allow pupils to give some other examples of advantages of friction. Ask pupils list them down on a piece of paper and present it to the class. Component: Content 1 Teacher shows the articles concerning the disadvantages of friction. Allow pupils to discuss and give some other examples of disadvantages of friction. Teacher recaps the effects of friction that causes disadvantages in our daily life. Teacher gives the three examples in our daily life that shows the disadvantages of friction. Allow pupils to give some other disadvantages of friction. Ask pupils to list them down on a piece of paper and present it to the class. Component: Content 2
Step 2	Pupils need to group the items into the table of advantages and disadvantages of friction. Pupil has sixty seconds to do the grouping. This activity is game based. It covers all learning outcomes. Component: Activity
Step 3	There are five questions in this component cover the learning outcomes. For Questions 1 to 3, allow pupils choose the correct answers for the objective questions. Q4 contains of drag and drop, pupils need to drag and drop the correct answers for the questions appeared. Q5 consists of true or false questions. Pupils need to identify whether the statements are true or false. Teacher can use the evaluation that will assess the pupils’ understanding of the lesson. Component: Evaluation
Step 4	Teacher plays the Extension component about friction which is necessary in our daily activities. Too much friction or too little friction will cause problems in our life. Guide pupils to understand that how compromise is necessary to get just enough friction or a proper combination of frictions. Component: Extension
Conclusion	Teacher concludes the lesson by playing this component to further reinforce understanding of the lesson. Teacher asks pupils to state the advantages and disadvantages of friction. Prompt pupils to list the advantages and disadvantages of friction in a class. Component: Summary