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Technology

Grade 8

Structures

Module 4

The basics of sketching

Activity 1

The basics of sketching

Focus task 1

Although we quite readily use the excuse that we “cannot draw”, it is useful to remember that sketches were used in prehistoric times, even before people learnt how to write. It may be true that some people have greater artistic ability than others when it comes to drawing, but even the greatest artists did not just begin to make art. You are also able to develop your drawing skill and it is important to do this by practising methods that will help you to make good sketches. Bear in mind that sketches are free-hand drawings.

Some guidelines:

  • Use a soft pencil, e.g. HB
  • Grasp the pencil between your fingers, about 20 mm from its tip.
  • Do not rest your hand on the paper while you draw (do free-hand drawing)
  • Hold the pencil at an angle so that you are able to see its point.
  • Be relaxed about what you are doing.

Try the following steps:

  1. Draw a number of parallel lines, vertically, horizontally and diagonally. Try to focus on the point towards which you are drawing the lines, and keep your wrist from bending.
  1. Once you feel at ease with drawing parallel lines, you may start drawing horizontal and vertical lines to form right angles (90 degree angles).
  1. When you are able to draw these right angles confidently, you are ready for the next step: drawing squares. Squares and rectangles are commonly used to frame other objects that are sketched.
  1. If you have to draw a circle, it may be useful to sketch a square – lightly. The sides should be equal to the diameter of the circle that is required. By marking the centres of the four sides you will identify the points of contact of the circle.
  1. When you need to draw an elliptical shape, you may start by drawing a rectangle to guide you.

LO 2.1

Assessment

LO 2
TECHNOLOGICAL KNOWLEDGE AND UNDERSTANDING The learner will be able to understand and apply relevant technological knowledge ethically and responsibly.
This is demonstrated when the learner:
structures:2.1 demonstrate knowledge and understanding of frame structures:
  • the use and application of basic structural components (columns, beams, arches, buttresses, struts, stays, guys, ties);
  • reinforcing techniques for frame structures (triangulation, webs and fillets, orientation and cross-sectional area and members);
  • how frame structures can be made strong (e.g. relationship between the size and the shape of the base, the centre of gravity and stability;
processing:2.2 demonstrates a knowledge and understanding of how materials can be processed to change or improve their properties by adapting them to suit particular purposes:
  • to withstand forces (tension, compression, bending, torsion, shear);
  • to increase strengths or life-span;
  • how specific properties suitable for packaging can be achieved.

Memorandum

ACTIVITY 1

  1. The learners must draw lines by linking dots. An additional suggestion: work from both dots for lines to meet in the middle (By doing this, it is less likely that the line will miss the dot).

2. and 3. Suggest that learners practise drawing straight freehand lines on loose sheets of paper.

4. and 5. Bear in mind that these are freehand sketches. Adequate opportunity for practising freehand drawing on loose paper is therefore important. Also encourage learners to practise in context, e.g. by drawing the wheels of a vehicle, etc.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Technology grade 8. OpenStax CNX. Sep 13, 2009 Download for free at http://cnx.org/content/col11052/1.1
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