Measurement of Mass

WEEK 3

Topic: Measurement of Mass
Learning Objectives: Pupils should be able to:

1. Explain the meaning of mass.
2. Mention instruments used to measure mass.
3. State the units of mass.

Content:
Meaning of Mass:
Mass is the amount of matter contained in an object. It does not change even if the object is taken to another place.

Instruments for Measuring Mass:

• Beam balance
• Digital scale
• Spring balance

Units of Mass:

• Gram (g)
• Kilogram (kg)
• Milligram (mg)

Conversion:
1 kilogram (kg) = 1000 grams (g)

Examples:

• The mass of a bag of rice can be 50 kg.
• The mass of a pencil can be 10 g.

Class Exercise 1:

1. Define mass.
2. Mention two instruments used to measure mass.
3. State the unit of mass used for heavy objects.

Class Exercise 2:

1. If a bag of beans weighs 25 kg, how many grams is that?
2. Name the instrument used to measure the mass of sugar in a shop.

Assignment (MCQs):

1. The amount of matter in an object is called: a) Volume b) Mass c) Length d) Height
2. Which of these is NOT an instrument for measuring mass? a) Beam balance b) Spring balance c) Thermometer d) Digital scale
3. 1 kg = ____ g a) 10 b) 100 c) 1000 d) 10000
4. The mass of a loaf of bread is measured in: a) kg b) cm c) ml d) m
5. The SI unit of mass is: a) metre b) gram c) litre d) degree