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Grade 7

Working with wind and water

Module 8

Making a water-wheel


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.


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________________


Assignment 1

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

Questions & Answers

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Akash Reply
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s. Reply
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Devang Reply
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Mostly, they use nano carbon for electronics and for materials to be strengthened.
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s. Reply
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s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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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
good afternoon madam
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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silver nanoparticles could handle the job?
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I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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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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