TECHNOLOGYTECHNOLOGYWORKSHOPWORKSHOP

SYSTEMS & CONTROLSYSTEMS & CONTROL

PRESENTERS: PRESENTERS: C.C. JACOBS &C.C. JACOBS &

J.FORTUIN J.FORTUIN

To be effective in Technology, To be effective in Technology, teachers have to develop teachers have to develop

three dimensions of three dimensions of knowledge. knowledge.

Knowledge about TechnologyKnowledge in TechnologyGeneral Technological Pedagogical

knowledge (Reddy 2001)(Reddy 2001)

NCS: The kind of teacher NCS: The kind of teacher envisagedenvisaged

Qualified, competent, dedicated & caring. Mediator of learning Interpreters and designers of Learning

Programmes & materials. Researchers Lifelong learners Learning Area specialists (RNCS Technology 2002)(RNCS Technology 2002)

Our philosophy @ CPUT Our philosophy @ CPUT (Technology)(Technology)

Integration of the three LO’s LO. 1 is my vehicle, LO. 2 my fuel and LO. 3 is my road signs. Integration with other LA

Weighting of the three LO’sLO.1 50%LO.2 25%LO.3 25%

Teaching through INVESTIGATION!Teaching through INVESTIGATION!

INTEGRATION OFINTEGRATION OF ASSESSMENT STANDARDS ASSESSMENT STANDARDS

TECHNOLOGY LEARNING AREA

LO1 LO2 LO3

AS1

AS2

AS3

AS1

AS2

AS3

AS4

AS1

AS2

AS3

OTHER Learning Area

LO2

AS3

AS2

AS1

Integration 1 also called clustering

Integration 3

Inegration 2

LO 1 DESIGN PROCESSLO 1 DESIGN PROCESS LO 2 KNOWLEDGELO 2 KNOWLEDGE LO3 SOCIETY & ENVIRONMENTLO3 SOCIETY & ENVIRONMENT

SYSTEMS & CONTROLSYSTEMS & CONTROL

MECHANICAL ELECTRICAL

Controlling energy & movementControlling energy & movement

THE MIGHTY FIVETHE MIGHTY FIVE

LEVERSINCLINED PLANEWEDGESCREWWHEEL & AXLE

PURPOSE OF MECHANISMSPURPOSE OF MECHANISMS

To reduce the load or to make it easierIt has mechanical advantageControls movement and power.PROPERTIES:PROPERTIES: It has an Input, Process and OutputChange the direction of movement

INSET, PROCESS & INSET, PROCESS & OUTPUTOUTPUT

INSETINSET: Energy or movement being done

PROCESSPROCESS: Transforms energy into work

OUTSETOUTSET: Movement or power that addresses the desired need

OUTPUT MOVEMENTOUTPUT MOVEMENT Linear movementLinear movement

Reciprocating movementReciprocating movement

Oscillating movementOscillating movement

Rotating movementRotating movement

LEVERSLEVERS

Simple mechanism: stick or pole

First class lever First class lever

L

F

E

Second class leversSecond class leversL

E F

Third class leversThird class levers

L E F

Examples of Everyday leversExamples of Everyday levers

Linkages (2 or more levers)Linkages (2 or more levers)

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System Diagram (Grade 9)System Diagram (Grade 9)

Complex Complex mechanismsmechanisms

Synchronized movementSynchronized movement

4 STROKE ENGEN4 STROKE ENGEN

STEAM LOCOMOTIVESTEAM LOCOMOTIVE

Wheel & Axle - GearsWheel & Axle - Gears

 

 

Rack and pinion

Worm gear

Bevel gears

Spur gears in motion

GEARBOXGEARBOX

Cams & Cam followersCams & Cam followers

CIRCULARCIRCULAR PEAR PEAR HEART DROPHEART DROP

Cams & Cam followersCams & Cam followers

PRACTICAL EXAMPLESPRACTICAL EXAMPLES

SINCHRONISED MOVEMENT SINCHRONISED MOVEMENT BETWEEN MECHANISMSBETWEEN MECHANISMS

GearsGears

PRACTICALPRACTICAL