Thursday, 10 November 2011

Lesson 33

Lesson 33: Complex Machine

Learning Objective

Analysing a complex machine

Syllabus Correlations

· Theme: Investigating Technology

· Learning Area: Machine

· Learning Objective: Analysing a complex machine

Learning Outcomes:

Pupils should be able to:

· identify simple machines in a complex machine

· conclude that a complex machine is made up of more than one simple machine

· give examples of complex machines

Concept(s) Introduced:

· what complex machine is and what it consists;

· give examples of complex machines.

Skills Covered:

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

Vocabulary/ New Words:

complex machine, fulcrum, gear, inclined plane, machine, screw, wheel and axle

Value(s) Incorporated:

· Having an interest in and curiosity about the environment.

· Being diligent and persevering.

· Realising that science is a means to understand nature.

· Thinking rationally

· Analysing the things around us

Materials Needed:


Point(s) to Note:

Explain what complex machine is and the examples.

Teaching Strategies

Set Induction

Show the videos of examples of complex machines. Teacher explains what a complex machine is. Ask pupils the simple machines involved in complex machines such as bicycle, wheelbarrow, scissors and hand drill.

Component: Introduction

Step 1

Play the content component. Ask pupils on examples of simple machines.

Teacher gives examples. Ask pupils whether they know what simple machines are involved in each complex machine namely watch, wheelbarrow, crane and bicycle pedals.

Play the content component. Teacher introduces an example of complex machine is a watch. Ask pupils what are the simple machines involved and their functions. Show the video on how the gears in a watch work. Ask pupils what is the use of a watch.

Play the content component. Teacher introduces a wheelbarrow. Ask pupils are the simple machines involved and their functions. Explain that force is applied at the handle and the wheel acts as the fulcrum. Ask pupils what benefits the wheel and axle system in a wheelbarrow brings.

Play the content component. Teacher introduces a crane as a complex machine. Ask pupils what simple machines are used. Ask pupils the use of a crane.

Play the content component. Introduce bicycle pedals and chain. Ask pupils what are the simple machines found. Ask pupils what the pedals and chain act as respectively. Teacher explains that the large gear rotates and this also rotates the chain. Small gear also rotates and this moves the bicycle. Teacher highlights that different gear size influences the bicycle speed.

Component: Content

Step 2

Play the activity component. Ask pupils find objects around the library compound. Ask pupils to identify the simple machines involved in each object. Tell pupils to observe the objects and record how each simple machine helps the complex machine to work.

Component: Activity

Step 3

There are five questions in this component covering the learning outcomes. Questions 1 to 3 are objective questions. Q4 is a drag and drop activity. Pupils drag and drop the correct answers for the questions. Q5 consists of true or false questions. Pupils need to identify whether the statements are true or false.

Use evaluation sheets to assess the pupils’ understanding of this lesson.

Component: Evaluation

Step 4

A case study on the types of levers. Ask pupils to name the types of levers and differentiate them. Teacher explains how the fulcrum, effort and load are positioned in each type of lever. Ask pupils to give an example for each type of lever.

Component: Extension


Conclude the lesson by playing this component to further reinforce understanding of the lesson. Help pupils to know what complex machine is. Emphasise the simple machines that make up a complex machine.

Component : Summary

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