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Technology

Grade 9

Mechanisms and motion

Module 5

Screws

  • Screws differ from nails because they have a thread. Screw thread make use of inclined plane principle. What is an inclined plane? It is simply a sloping surface used to make jobs easier like in the picture below.
  • Screw threads are used to provide powerful movement, for instance in car jacks, to hold things in place (e.g. nuts and bolts) and to position things accurately (e.g. to adjust a shifting spanner). There is more technical information regarding screws, such as different thread types, which you would learn about if you were to become an engineer.

Activity 1

Questions based on the picture.

  1. Name two mechanisms used in this device.
  1. This invention proved to be useful in the olden days. Why?
  1. Are there modern versions of this mechanism? Explain.
  1. Write a brief paragraph on how the development of mechanisms has affected the waste industry and the mechanical equipment they use. Also reflect on the effect this could have on the environment.
LO 3.2

Your Challenge

  • You have learnt a lot about mechanisms in this module. You might have found some mechanisms more interesting than others. You might also say that this is too technical for you or that the calculations are too difficult.
  • The truth is that everyone use mechanisms every day. Whether they are technical or not, people have to open doors with handles, switch on lights with lever switches and change gears with a gearlever.
  • We now set you two challenges. Use the Technological process and produce a project portfolio to solve the problems. In both only a scenario is given. You need to write your own design brief, specifications, ideas, final idea, manufacture (scenario 2 = scale model) and evaluation. Your educator will guide you on what materials and tools are available.

Scenario 1

  • Since Technology is a fairly new subject in schools, educators find it very difficult to explain and demonstrate mechanisms. There are very few resources and examples and little equipment available from the South African education department. Choose any mechanism and design and make a demonstration mechanical tool, example or mechanical toy which an educator can use.

Scenario 2

  • Many people are keen on 4x4 outings. This has opened a new market for 4x4 accessories. Equipment needs to be strong, light and must be able to fold up to take as little space possible when travelling. There is a variety of equipment available and designers are still producing brilliant new ideas for the 4x4 enthusiast. You are part of such a design group whose task is to design and evaluate new products for this market.

Assessment

LO 3
TECHNOLOGY, SOCIETY AND THE ENVIRONMENT The learner will be able to demonstrate an understanding of the interrelationships between science, technology and the environment.
We know this when the learner:
impact of Technology:3.2 recognises and identifies the impact of technological developments on the quality of people’s lives and on the environment in which they live, and suggests strategies for reducing undesirable effects.

Memorandum

ACTIVITY 1

1. Screw and crank-handle

2. First kind of pump. Worked manually, electricity not available. Rivers were the main source of drinking water – no taps in houses.

  1. Pumps used in bore-holes.
  2. For this essay, learners have to do research on how mechanisms have been used to facilitate the improvement of the waste industry. They also have to determine the possible effects on the environment.

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
I rally confuse this number And equations too I need exactly help
salma
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
salma
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
hi
salma
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
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 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11071/1.1
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