Structures can be either man-made or natural.
Man-made structures are made by people hence the term man-made. Examples include a bicycle, chair, crane. Natural structures are found in the environment. Examples include trees, spiderweb, caves.
Activity
(3.1) Classify whether the following structures are natural or man-made:
3.1.1 – Tree
3.1.2 – Clay pot
3.1.3 – Car
3.1.4 – Plant
3.1.5 – House
3.1.6 – Sand
3.1.7 – Bridge
(3.2) Draw any two examples of the following types of structures:
3.2.1 – natural structures
3.2.2 – man-made structures
TYPES OF STRUCTURES
1) Shell structures – A shell is used to enclose, hold, contain or protect something. Examples are an egg or a bottle.
2) Frame structures – Made up of parts, called members, which are joined together (parts or pieces of a frame structure). Examples are pylons, a crane, the human skeleton, a chair or window frames.
3) Solid structures – Made up almost entirely of matter, throughout with same material. Examples are a mountain (natural) or a brick (man-made).
Activity
(4.1) Draw one example of each of the following structures:
4.1.1 – Shell structure
4.1.2 – Frame structure
4.1.3 – Solid structure
4.1.2 – Explain how structures help you in your everyday life
(4.2) Explain how a camping tent is first a frame structure, as well as a shell structure.
4.2.1 – Draw two separate pictures showing how a camp tent is first a frame structure and then a shell structure.
OTHER STRUCTURES
They can be a combination of a shell, frame or solid structure. Examples are a bird cage, a kite, a rib cage.
Activity
(5.1) List any two ‘other structures’ that you know of.
Activity
Classify each structure listed below. First work out if it is a natural or man-made structure, then decide if it is a shell, frame or solid structure:
6.1 – A washing line
6.2 – A kennel
6.3 – A crane
6.4 – An igloo
6.5 – A concrete wall
6.6 – A cave
6.7 – A rondavel
6.8 – A rock
6.9 – A chair
6.10 – A Zulu pot
6.11 – An apple
6.12 – A spiderweb
Teacher, Ryan Naicker encourages learners to practice the lesson above and contact him on 066 220 0004, should they need assistance.
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