# Lesson Plan of Units of Mass/Weight

## Students` Learning Outcomes

• Measure and write standard units of mass/weight including abbreviation.

### Information for Teachers

• Physical balance or spring balance, which is used to measure the mass/weight of different objects, should be error free.

• While teaching the lesson, the teacher should also consult textbook at all the steps where and when applicable.

### Material / Resources

Writing board, chalk / marker, duster, physical balance, weights (5kg, 2kg, 1kg, 500g, 200g, 100g, 50g), wooden log, stones, medicine bottle, hard ball, bat, ink bottle

### Introduction

• Ask following questions to the students;
• Which unit of mass is used to measure the mass of light objects like a pencil or chalk?(gram)
• Which unit of mass is used to measure the mass of heavy objects like a chair or table? (kilogram)

### Development

Activity 1

• Show the physical balance and weights to the students and tell them how to measure the weight of object.

1. Tell them, place the object in the left hand pan and put the standard weights in right hand pan.
2. If the right hand pan is above the left hand pan then put the heavier weight in the right hand pan.
• If the left hand pan is below the left pan then put the lighter weight in the right pan.
1. When both sides are balanced.
2. Then sum of the weights in the right pan is the mass of object (placed in left pan)
• Ask them to measure the mass/weight of their full school bag by using a balance or physical balance.
• Facilitate students in measuring the weight.

Activity 2

• Place the different objects like wooden log, stones, medicine bottle, hard ball, bat, ink bottle on the table etc.

• Also place the different standard weights like; 50g, 100g, 200g, 500g, 1kg, 2kg, on the table.

• Ask the students to hold the different weights in their hands and feel the weight.
• Then hold the different object one by one in their hands and guess these weights.
• Now show them physical balance.

### Sum up / Conclusion

• Sum up the lesson by repeating rules of measurement of weight.
• Put the object in the left hand pan and put the standard weights on right hand pan.
• When both sides are balanced, sum the standard weights(right pan)
• This sum is a mass of the object (placed in left pan)

### Assessment

• Ask following question to the students;
• Which is heavier a book or a wooden duster?
• Which unit of weight is used to measure the weight of your school bag?
• Which unit of weight is used to measure the weight of a button?
• Which unit of weight is used to measure the weight of a horse?
• Find the weight of a packet of beans?