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Summary Natural Science - TERM 1 -Study Notes
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Natural Science - TERM 1 -Study Notes Short Questions Photosynthesis and respiration Factors that disturb the eco-system
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1Technology
Grade 9
Study Notes
Term 1
Time: 1 hour
Total: 60
1. Definitions
Frame structure An open structure typically made up of
parts which include beams, columns and
slabs.
Beams A solid structure that lies horizontally and
spans distances.
Lintels A solid structure that supports the walls
above doors and windows of buildings.
Suspension It takes a long time to build the bridge.
bridge Ground conditions sometimes make it
difficult to find anchorage for the main
cables.
Arch A curved symmetrical structure spanning
an opening and typically supporting a
bridge, roof, or wall above it.
Without a keystone, the arch is not strong.
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, 2
The keystone holds the other stones in
place and the arch together.
This is a system utilized to reinforce building
Internal cross- structures in which diagonal supports
bracing intersect. Cross bracing is usually seen with
two diagonal supports placed in an X-
shaped manner
I-beams I-beams are designed to resist bending,
vibration, yielding, and reflecting due to
their shape
Artistic drawing Provides a realistic interpretation of what
an object will look like.
Two-point A perspective drawing is three-dimensional
perspective to represent the true image of an object.
In perspective drawing we use different
abbreviations. The abbreviation S.P. stands
for station point.
The plane which we see from where we
stand is called the vertical plane.
The plane on which we stand while looking
at the major planes is called the horizontal
plane.
Scale An object that is drawn at a scale of 1:15 means the drawing is 15 times
smaller than the actual object.
Corrosion Corrosion is the gradual construction of a material.
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