# 3.8 To use units of measurement and explaining why it is important

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## Memorandum

Assignment 4:

1.

• km
• m 3
• mm
• g en mg
• kl of m 3
• m 2
• m en cm
• ton
• kl of cm 3
• light years (the distance light travels in one year)
• Examples to explain the importance of measurement: any three good examples, e.g.
• the amount of medicine someone has to drink
• how much cement and sand should be mixed for building
• to measure achievements in athletics (high jump, long jump, sprints, etc.)

## Activity: to use units of measurement and explaining why it is important to be able to measure [lo 2.4]

Before I am able to determine my expenses with regard to fuel for a planned journey, I need to know the distance that I will be travelling. If I want to tile the kitchen floor, I need to calculate the size of the floor (surface). When we want to work out how much milk a baby of a particular age and mass should get, we need to be able to measure the volume (contents) of a bottle, etc. The metric system of measurement (the Système International d'Unités , or SI) is used in most parts of the world. The most important units that we have to deal with according to the SI system of measurements are represented in the following table:

 LARGE MEDIUM SMALL Length 1 km = 1 000 m1 m = 1 000 mm kilometre (km) meter (m)centimetre (cm) millimetre (mm) Surface 1 cm² = 100 mm²1 m² = 10 000 cm² square meter (m²) square centimetre (cm²) square millimetre (mm²) Content 1 kℓ = 1 000 ℓ1 l = 1 000 ml kiloliter (kℓ)cubic meter (m 3 ) litre (ℓ) cubic centimetre (cm 3 )millilitre (mℓ) Mass 1 kg = 1 000 g1 g = 1 000 mg kilogram (kg) gram (g) milligram (mg)

1. Give the units of measurement that you would use to measure the following?

• the distance that a space shuttle travels around the earth.
• the amount of concrete required for the foundations of a house
• the circumference of roller skate wheels.
• the mass of a locust.
• the capacity of a swimming pool.
• the size (surface) of a tennis court.
• the length of our educator.
• the mass of a truck.
• the capacity of a hot water cylinder.
• the distance from the earth to the nearest star.

2. Name three further examples to show the importance of being able to measure.

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## Assessment

Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard 2.4: We know this when the learner application of knowledge: applies knowledge appropriately by connecting the learnt concept to a variation of the known situation.

explain and give four Example hyperbolic function
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