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					              Cape Teaching and Leadership Institute

                Technology in the Intermediate Phase
                               Term 3 of 2008

          Focus area: Systems and Control: Mechanisms

                 Project: Balloon powered buggy

Phase                Intermediate
Grade                5
Learning Area        Technology
Focus area:          Systems and control: Mechanical Systems;
                     power sources; wheels and axles
                     Structures: reinforcement; different types of structures


Outcomes for this session:

At the end of this session:

  Educators will have knowledge of systems and control:
       wheels and axles
       power sources
 Educators will have knowledge of stuctures
       reinforcement
 Educators will have made a buggy with cheap materials
 Educators will have worked through the Design Process.


Focus area knowledge: Systems and control

   This content area is divided into mechanical systems (including
    hydraulic and pneumatic systems) and electrical systems.
   The study of mechanical systems focuses on producing movement in
    some way, and examines howenergy sources can be used to power
    products to produce movement. In the higher grades, the learnershould
    engage with the concept of mechanical advantage and how mechanical
    systems are used to achievesuitable speeds, forces or drive ratios.
   The study of electrical systems focuses on the practical use of
    electrical energy in circuits to satisfyspecific needs. Electronics,
    covered at higher levels, is seen as closely related to electrical circuits
    butdeals more closely with low current signaling and sensing.
   The learner explores the Systems and Control content area through
    contexts like transport, lighting, household devices, simple machines.


                                        1
Teacher's Instruction Rubric: Balloon Powered Buggy

Phase                   Intermediate
Grade                   5
Learning Area           Technology
Focus area              Systems and control: power sources; wheels and axles
                        Structures: reinforcement; different types of structures

Main practical outcomes
 Learners understand how to use a balloon as a source of power to move a buggy (Gr 5 S&C 5.2.3.1)
 Learners understand the concepts of friction and directional stability relating to wheels and axles;
   bearings and spacers. (Gr 4 S&C 4.2.3.1)
 Learners appreciate the structural properties of card in various configurations and forms e.g. body,
   wheels, straps, etc.. (Gr 4 Structures 4.2.1.1; Gr 5 Structures 5.2.1.1)
 Learners understand the concepts of potential and kinetic energy. (Natural Sciences LU2)

Situation

Cadbury‘s have donated huge boxes of choclates for a ‘fun project in Technology‘. They hope that the
competition will be reported in the local press so their products are advertised. You like Cadbury's chocolate
and you want to win!

Design Brief

You are challenged to design and make a balloon-powered buggy decorated attractively with the Cadbury
logo. It must travel 5m down a smooth path 2m wide.

Constraints

Use only:
 180g Reviva beige card for the body and wheels
 kebab sticks and plastic straws for axle systems
 white glue
 one balloon for power, with a straw (taped in) for a nozzle

Avoid the use of tape and other types of glue

Enabling Tasks

A. Make and test a box buggy:
 Use the card worksheet to make the TYPE A buggy
 Test it by rolling it down a ramp and measuring the distance it travels

B. Teacher demonstration:
 The effect of straws of different diameters/lengths in a balloon.




                                                      2
Case Study

Study & comment on the toy vehicles brought from home:
 structure (frame and shell)
 power (include: gravity, elastic band, battery)
 wheels and axles (include: fixed or free; size; tread)

Investigation

   Study
        o the vehicles already made
        o the sheet of shapes
        o and toys brought from home.
   Discuss possible power sources
   Discuss factors which influence the structure/shape/form of the body
   Study the vehicles made: (Grade 4 revision)
        o investigate factors which influence friction on the axles and wheels
        o investigate factors which influence the ability to ‘go straight‘
   Attach a balloon to your vehicle to make it move.
        o Investigate factors which influence the ‘powering‘ effect of the balloon.


Design, Make and Evaluate

   Sketch, label and measurement the 3 views of your first buggy in pencil.
    (The ASs require measurementing only in Gr 6, but the ASs describe the miniumum requirement)
   Improve your design using colour and labels and comment on all changes.
   Now plan a better buggy - your own buggy - your own design.
        o That is decorated attractively with the Cadbury Logo
        o That possibly goes faster and further
        o That possibly looks more like a car or bakkie
   Sketch the design of you new buggy using:
        o Colour
        o Labels
        o with comments about all the improvements
   Make your final model.
   Test the buggy's performance on a flat surface.
   Test and Evaluate the project.


Test

The questions for the test on page 13 are to be set by the educator in the light of the prior research work.


Extra

Draw a pictorial sketch of the completed model, to complement previous drawings and reveal all pertinent
details in colour. Measurementing and labelling are not needed here.

----------------------------------------------------------------------------------------




                                                        3
Technology Project: Balloon Powered Buggy

Name              ................……………....                Date started          ........./......../.........

Grade             ......................................   Planned completion    ........./......../.........



Situation
Cadbury‘s have donated huge boxes of choclates for a ‘fun project in Technology‘. They hope that
the competition will be reported in the local press so their products are advertised. You like
Cadbury's chocolate and you want to win!



Design Brief
You are challenged to design and make a balloon-powered buggy decorated attractively with the
Cadbury logo. It must travel 5m down a smooth path 2m wide.



Constraints

Use only:
 thin card for the body and thicker card for wheels
 kebab sticks and plastic straws for axle systems
 white glue
 one balloon for power, with a straw (taped in) for a nozzle

Avoid the use of tape and other types of glue.



Descriptiom of the problem in my own words
5.1.2.1 Write Brief

Situation: …….....................................................................................………………………............

………………………………………………………………………………………………………………..

Function of the solution: …………………………………………………………………………………..

………………………………………………………………………………………………………………..

Performance of the solution: ………………………………………………………………………………

………………………………………………………………………………………………………………..

Materials that may be used: ………………………………………………………………………………

………………………………………………………………………………………………………………..

Source of energy: …………………………………………………………………………………………..


                                                               4                                                          3
Sketches: 3-Views
5.1.5.1 Draw to convey information

   Large pencil sketches of the TYPE A buggy
   Show the size and shape of the body
   Show the detail of where the axle fits into the body.
   Label all parts once
   Write only the measurements needed to make the buggy. Write measurements once only.

Side View




Front View




Plan View (Bird's eye view)




                                             5                                            5
Case Study
5.1.1.2 Investigate exisiting products                       Think About:
   Study the cars/toys brought to school by your friends
   Write down interesting points about the toys                Purpose
Structure:                                                       Terrain


                                                              Size (H,L,W)
                                                                 Shape


                                                                  Load
                                                                 Speed
                                                                 Power
Power:
                                                                  Style
                                                                  Shell
                                                                 Frame
                                                                Chassis


                                                            Front-wheel drive
                                                            Rear-wheel drive

Axles:                                                          Wheels
                                                                 Axles
                                                               Drive-axle
                                                              Driven-axle


                                                               Differential
                                                               Stub-axle
                                                                Half-axle
                                                                Full axle
Wheels

                                                                Bearings


                                                                Material
                                                                  Cost




                                                 6                          5
Research
5.1.1.3 Do research

Study the pictures and books brought by your teacher.


Power sources

   What different types of power source do you see?


.............................................................................


.............................................................................

   Are there any other type of power source? Name them.


.............................................................................


.............................................................................

   What types of power source could we possibly use in our buggy?

..
 ...........................................................................


.............................................................................

   OK. So we are going to use a balloon as our power source. Describe the properties of an ideal
    balloon-power-source.


.............................................................................


.............................................................................

Shape/form of the buggy

   What things do you think will effect the shape/form of the buggy?


.............................................................................


.............................................................................


.............................................................................


.............................................................................

                                                 7                                             2
Research
5.1.1.3 Do research

   Play with your own Type A buggy and study it to answer the questions below.


What things might influence friction on the wheels/axles of your buggy?




What things mightr influence your buggy 'going straight'?




What things might influence the 'powering effect' of the balloon?




                                                8                                 3
Sketches of my own, new, improved Buggy
5.1.2.2 Alternative solutions

   Sketch the whole buggy lightly in pencil.
   Then colour only the improvements you plan to make.
   Label all improvements.
   Comment on all improvements.


First possible solution




                                              9           5
Second Possible Solution
5.1.2.2 Alternative solutions




                                                                                                              5
 Decision: I have decided to use the first / second design because . . . . . . . . . . . . . . . . . . . . . . .
 5.1.2.3 Choose and develop a solution

 ..............................................................................


 .........................................................................

                                                      10                                                      2
Product Test and Evaluation                           Tested by _______________
5.1.4.1 Evaluate the product

                   At least one question must be in connection with the power source.

                     Test                                                     Result

1   ___________________________________________________   1    ________________________________________________

_____________________________________________________      __________________________________________________

_____________________________________________________      __________________________________________________

2   ___________________________________________________    2   ________________________________________________

_____________________________________________________      __________________________________________________

_____________________________________________________      __________________________________________________

3   ___________________________________________________    3   ________________________________________________

_____________________________________________________      __________________________________________________

_____________________________________________________      __________________________________________________

4   ___________________________________________________    4   ________________________________________________

_____________________________________________________      __________________________________________________

_____________________________________________________      __________________________________________________


Evaluation

Say what you would do to improve the product and how you would do it

If I were to design and make this product again, I would improve my work in the following three
ways:

1   ________________________________________________________________________________________________________


___________________________________________________________________________________________________________


___________________________________________________________________________________________________________


2   _________________________________________________________________________________________________________


___________________________________________________________________________________________________________


___________________________________________________________________________________________________________


3   _________________________________________________________________________________________________________


___________________________________________________________________________________________________________


___________________________________________________________________________________________________________


                                                      11                                                          10
Pictorial/3-D sketch of the completed buggy after final testing
5.1.5.1 Draw to convey information


   Show all details not revealed previously.
   Labelling is not required.
   Use full colour.





                                                12                1
I know a lot about . . . . . . .
(The questions are to be set by the educator in the light of the prior research work)
4.2.3.1 K&U about wheels and axles
5.2.3.1 K&U about energy sources
5.2.1.1 K&U about types of structure

    wheels and axles
    energy sources
    strong structures

Question 1

……………………...........................................................................................................................

……………………...........................................................................................................................

Answer 1

……………………...........................................................................................................................

……………………...........................................................................................................................

Question 2

……………………...........................................................................................................................

……………………...........................................................................................................................

Answer 2

……………………...........................................................................................................................

……………………...........................................................................................................................

Question 3

……………………...........................................................................................................................

……………………...........................................................................................................................

Answer 3

……………………...........................................................................................................................

……………………...........................................................................................................................

Question 4

……………………...........................................................................................................................

……………………...........................................................................................................................

Answer 4

……………………...........................................................................................................................

……………………...........................................................................................................................
                                                                  13
                                                                                                                                      4
Assessment of the Project




                                                                                  Page Reference




                                                                                                                                                                                                    Not applicable
                                                                                                                                                    Reqts partially
                                                                                                    Possible Mark




                                                                                                                                    Requirements




                                                                                                                                                                      Requirements


                                                                                                                                                                                     Requirements
                                                                                                                    Mark attained


                                                                                                                                    not satisfied
       Knowledge, Understanding, Skills and Values




                                                                                                                                                                                     exceeded
                                                                                                                                                    satisfied


                                                                                                                                                                      satisfied
LO1: Processes and Skills
Invest          5.1.1.1   Finds out about background context                        -
                5.1.1.2   Finds out about existing products                       6                 5
                5.1.1.3   Performs (scientific) investigations                    7/8               5
Design          5.1.2.1   Writes, with assistance a design brief                  4                 3
                5.1.1.2   Suggests & records two alternative solutions           9/10              10
                5.1.2.3   Chooses one solution                                    10                2
Make            5.1.3.1   Plans (steps for making &) drawings & sketches            -
                5.1.3.2   Uses suitable tools & material                         Make              15
                5.1.3.3   Works neatly and safely                                Make
Evaluates       5.1.4.1   Evaluates the product                                   11               10
                5.1.4.2   Evaluates the plan of action                              -
Communicates    5.1.5.1   Draws 2-D drawings, labeled and rendered               5/12              5+1
                5.1.5.2   Uses approp. tech to present & record & comm.             -
LO2: Knowledge and Understanding
                          K&U of different types of structure and relationship
Structures      5.2.1.1
                          between materials and load
                                                                                 Make
                          K&U of how simple processing transforms
Processing      5.2.2.1
                          materials
                                                                                    -
                          K&U of how to use wheels and axles to make a
Mechanisms      4.2.3.1
                          product move
                                                                                    -                -                -                 -                -                -              -               -
                          K&U of how to use energy sources to power
                5.2.3.1
                          mechanical systems to make a product move
                                                                                  13                4
                          K&U of how diff types of mvt can be achieved and
                6.2.3.1   how systems change an input mvt to a different            -                -                -                 -                -                -              -               -
                          output mvt
L03: Tech, Society and Environment
                          Recognises how products and technologies have
Indig+Culture   5.3.1.1
                          been adapted from other times and cultures
                                                                                    -
                          Identifies posssible pos & neg effects on lives and
Impact          5.3.2.1
                          environment
                                                                                    -
Bias            5.3.3.1   Describes consequences of lack of access                  -
                                                                                 Total             60



Teacher’s Comment




                                                            14
Some possible open-ended cross sections for balloon powered buggies




                           Total
                                   Side 1   Side 2       Side 3   Side 4   Side 5   Side 6   Side 7
                Shape      width
                                    mm       mm           mm       mm       mm       mm       mm
                           mm
               Cylinder    210      10       200

               Rectangle   297      17       30           110      30       110

               Open Box    297      10       40           40       117      40       40       10

                Flat M     297      50       50           50       50       50       47

               Triangle    210      10       66           66       66

                  ?




                                                     ?




                                     15
Buggy Sesifikasie/Secification

   Lengte/Length = 19cm
   Breedte/Width = 8cm
   Hoogte/Height = 4cm
   As lengte/Axle length = 12cm
   As houer lengte/Axle holder length = 10cm

Use only:

   1 sheet of 180g Reviva A4 card for the body




                                                          Naam/Name………………………………………………....
   1 sheet of 180g Reviva A4 card for the wheels
   2 kebab sticks for the axles
   1 straw for the axle holders
   1 balloon and ¼ straw for the ‘engine’
   Masking tape to fix the balloon to the straw
   Cold glue for all other construction work




                                                                  :
Gebruik net:

   1 vel 180g Reviva karton vir die bakwerk
   1 vel 180g Reviva karton vir die wiele
   2 kebab stokkies vir die asse
   1 strooitjie vir die as houers
   1 balon en ¼ strootjie for the ‘enjin’
   Masking tape om die balon aan die strooitjie vas to
    maak
   Koue lym vir alle ander konstruksie werk




                                16
17
Materials for the Ballon Powered Buggy



   Materials for 25 educators

   Notes                                 25

   Pencil                                25

   Scissors                              25

   Ruler                                 25

   Cutting board                         25

   Craft knife                           6

   A4 Reviva 180g or 220g Beige card     100

   Carbon paper                          25

   Paper clips                           100

   White Glue                            8 x 50ml bottles

   Straw (4 thin and 2 thick)            200

   Kebab stick                           125

   Balloon                               75

   Masking tape                          4 rolls

   Cadbury wrappers                      Brought by participants

   A4 bright paper                       25 mixed sheets

   Ramp: 2m x 1m 3mm hardboard           1

   Books: Technical aspects of cars      As many as possible

   Toy vehicles                          As many with different
                                         drive systems as possible
   Digital Projector and screen          1

   Own computer for 2x PowerPoint        -




                                         18

				
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