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Technology

Grade 7

Working with wind and water

Module 8

Making a water-wheel

INVESTIGATION

Problem situation

You are required to lift a certain number of drawing pins over a distance of 60 cm. Your power source is 4 ℓ of water that is supplied 1,5 m above the rotor in a 3 mm plastic pipe.

Design limitations

You may use any one of the following:

For the rotor:

  • a cork stopper or
  • two cardboard circles, each with a diameter of 20 cm or
  • an empty cotton reel

For the axle:

  • two toothpicks or
  • a knitting needle or
  • a 15 cm nail or
  • a long rounded pencil or
  • a kebab skewer

For the blades:

  • two egg boxes from which the “cups” have been cut out or
  • thick cardboard or
  • an empty 2 ℓ plastic cool drink bottle from which the blades can be cut or
  • a plastic margarine punnet from which the blades can be cut or
  • plastic teaspoons or
  • plastic ice-cream scoops (the flat kind)

Examples of water-wheels:

For the stand:

  • a ruler with wire that is fastened to the axle at both ends or
  • a piece of wood with string that is fastened to the axle or
  • an empty 2 ℓ plastic bottle with the bottom cut out or
  • a large plastic juice bottle or
  • a 2 ℓ plastic milk bottle

To supply the water source:

  • a jug that is marked in litres
  • a length of plastic tubing (1,5 m long, 3 mm in diameter) fastened to a funnel

To catch up the water: a large, flat plastic bowl

To lift the drawing pins (the hoisting apparatus):

  • string or
  • wool
  • a bowl with a flat bottom for the drawing pins
  • an eyelet

You will also need:

  • a pair of scissors
  • Prestik
  • plasticine
  • adhesive tape
  • a knife
  • glue
  • waterproof paint and varnish
  • a paint brush
  • a stapler
  • a pencil
  • a ruler
  • a stylus
  • a protractor (for positioning the blades)

Assignment 1:

To analyse a situation

[lo 1.5]

Let us analyse the situation and write a design proposal. (A design proposal is a short statement that could describe a probable solution.)

Complete the following:

I am going to design and make a ________that will be capable of lifting a

number of __________over a distance of _________cm vertically

by using some of the suitable material and tools that have been mentioned.

Design

Assignment 2:

To do research on hoisting apparatus and turbines

[lo 1.4]

Do research on hoisting apparatus (pulleys) and turbines (water-wheels) and draw or paste pictures of existing or antique machines. Briefly explain how they worked. (Find out more about the Egyptian shadoof or the water-wheels of Archimedes.)

Name the reference sources you made use of________________

Memorandum

Assignment 1

  • water wheel/crane (hoisting apparatus)
  • drawing pins
  • 60cm

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
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Maciej
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s. Reply
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Devang Reply
are you nano engineer ?
s.
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Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
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s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
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of graphene you mean?
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in general
s.
Graphene has a hexagonal structure
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Cied
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abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
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what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
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Ramkumar Reply
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AMJAD
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Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
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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
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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
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Damian
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not now but maybe in future only AgNP maybe any other nanomaterials
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I'm interested in Nanotube
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Source:  OpenStax, Technology grade 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11032/1.1
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