Unit 4 Energy

Topic

Energy change

Curriculum Link

4.2 Energy change

Estimated Lesson Time

80 minutes

Introduction

Students are engaged to attend to the different form of energy during a motion by a demonstration from teacher. Planning and designing skills for experiments are widely used in this activity. Students are required to complete two tasks in this learning activity. At first, they are invited to design a process that two or more energy conversions are involved with the same materials used in the teacher's demonstration. Then students will use their suggested materials to design another processes involving three or five energy changes.

Key question

How does the energy of an object change?

Learning Objectives

In this activity, the students should be able to

  1. dentify different forms of energy;
  2. describe how energy changes from one form to another;
  3. acquire planning & designing skills (SP3);
  4. acquire experimenting skills (SP4);
  5. use Sankey diagram to show the energy change (SP6).

Teaching Plan

Task (Time) Brief Description Materials Objectives

Engagement
(10 min)

Students are engaged to attend to different forms of energy during a motion by the following demonstration:

A ball rolls down a track.

Ask students : "what kinds of energy the ball carries?"

"what kinds of energy changes involved?"

Sankey diagram is introduced to show the energy change.

   (1) & (2)

Exploration
(20 min)

Task 1: Students are invited to design a process that can involve two or more energy conversions using the materials above

  1. Students design a new setup and draw it on WS1
  2. Teacher monitors their designs. Students conduct experiments to test their setup.
  3. Ask students to identify different forms of energy in their setup and label them in the diagram on WS1.
  4. Teacher selects one sample group and discuss with students about what kinds of energy conversions occurred.
 (3), (4) & (5)

Explanation
(5 min)

 Teacher teaches students how to present the energy conversions of the whole setup in paragraphs. Then ask students to complete the energy conversion system. (1), (2) & (5)

Engagement
(5 min)

Teacher shows a video about a system of complex energy conversions.

    

Elaboration
(20 min)

Students elaborate the concept of energy changes to a complex case in task 2

  1. Students are invited to design another process with materials available in laboratory involving three to five energy conversions.
  2. Teacher introduces the assessment criteria and explain the sample in WS2
  3. Students begin to discuss in groups.
  4. Students would be given the required materials and conduct their experimental setup.
  5. Each group tidy up the complete energy conversions of their setup on WS 2.
  6. Teacher helps students to check if any technical problems.
 (3), (4) & (5)

Explanation
(20 min)
  1. Students demonstrate their energy conversions in front of classmates.
  2. Students present the energy conversions of their setups.
  3. Other classmates observe the demonstrations carefully and give marks to the group.
 (4) & (5)

Apparatus and materials required:

Simple materials Complex devices Standard apparatus
Track Electric fan Stand and clamp
Ball Balloon  
Metal strip Torch  
Rubber band    
Dominos