MASS Objectives By the end of the section/lesson, students should be able to: - PowerPoint Presentation

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MASS

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Objectives

By the end of the section/lesson, students should be able to:

Distinguish among different units of mass (g, kg, tonnes)

Convert g to kg and vice versa

Distinguish between heavy and light

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Mass in our everyday life

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Measuring Instruments

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Analog and digital scale

Analog scale

Digital scale

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Different types of scale

SPRING BALANCE

HEAVY WEIGHT BALANCE

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Bathroom scale

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Digital and Analog display

The digital display The analog display

These scales are used to weigh the body mass.

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Activity

1:

Estimating and weighing body mass

Step 1: Students estimate their mass and record in their copy book

Step 2: Students weigh their body mass using the bathroom balance (given) and note in their copybook.

Student 1:

Student 2:

Student 3:

Student 4:

Student 5:

The teacher brainstorm with the students, about body mass and the units of measurement.

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Mass in kilogram

The scale is indicating 1 kg for the 5 bananas.

Here the spacing is 1 unit and the mass is read in kilogram or kg

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Consolidation Work

What is the mass of the apples?

A. 2 kg

B. 0.2 kg

C. 20 kg

D. 12 kg

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Consolidation Work

What is the mass of the packet of sugar?

A. 0 kg

B. 5 kg

C. 50 kg

D. 25 kg

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Consolidation Work

What is the mass of this packet of rice?

A. 6 kg

B. 16 kg

C. 60 kg

D. 4 kg

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Mass in gram

This cheese weighs 200 g

In this case, the divisions in red, represent 100 g, while each spacing in black shows 10 g.

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Example

What is the mass of the packet of butter in gram (g)?

A. 350 g

B. 200 g

C. 325 g

D. 300 g

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Example

How much does a packet of lentils weigh?

A. 515 g

B. 600 g

C. 500 g

D. 525 g

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Example

What would be the mass of the potato chips?

A. 70 g

B. 750 g

C. 850 g

D. 800 g

Mmm, that’s a huge packet of crunchy chips!!!

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Digital Scale

The mass of the chicken can be read directly from the screen of the digital balance. It weighs 2.5 kg.

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Example

Try to read the mass of the grapes.

A. 1.8 kg

B. 1.2 kg

C. 12 kg

D. 1.0 kg

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Activity 2: Differentiate Between Gram (g) And Kilogram (kg)

Provide students different goods (e.g., macaroni packet, books, pencil, eraser - masses in g and kg)

A pair is designated in each group - to weigh the items and note down in the copy book; to read the mass from the packaging

Measurement of masses in kg and g is brainstormed with the students. (What characteristic of the mass makes it possible to weigh in g or kg?)

Finally the students are questioned as to what would be the unit to weigh a wool ball.

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Consolidation work

Click on the unit of measurement you would use for each of the objects shown.

A. g

B. kg

A. g

B. kg

A. g

B. kg

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Consolidation Work

A. g

B. kg

A. g

B. kg

A. g

B. kg

A. g

B. kg

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Consolidation Work

A. g

B. kg

A. g

B. kg

A. g

B. kg

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Heavier or Lighter…

Remember the seesaw at the kindergarten!!

Who is lighter and who is heavier…

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Using the beam balance to compare masses…

Use the same logic and click on the object which is lighter

A

B

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Using the beam balance to compare masses…

Now, which fruit is heavier, A or B?

A

B

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Using the beam balance to compare masses…

And which vegetable is heavier, A or B?

A

B

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Using the beam balance to compare masses…

What can you say about these two objects?

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Measuring Mass Using Arbitrary Units

Given that one (1) soap weighs 100 g, compare and click the correct mass of the packet of macaroni:

A. 200 g

B. 125 g

C. 500 g

D. 550 g

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Measuring Mass Using Arbitrary Units

Given that one (1) soap weighs 100 g, compare and click the correct mass of the mushroom tin:

A. 410 g

B. 25 kg

C. 400 g

D. 420 g

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Measuring Mass Using Arbitrary Units

Given that one (1) soap weighs 100 g, compare and click the correct mass of the packet of biscuit:

A. 50 g

B. 100 g

C. 200 g

D. 220 g

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Measuring Mass Using Arbitrary Units

Given that one (1) soap weighs 100 g, compare and click the correct mass of the following objects:

A. 1050 g

B. 100 kg

C. 1002 g

D. 1000 g

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End of the

Section/Lesson: Mass