Natural sciences
Matter, measuring and reactions
Educator section
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.)
Leaner section
Content
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.