TECHNOLOGY LESSON PLAN GRADE 8 GRADE 8 TERM 1 Role Players (WHO is going to teach/ guide/ support…) Aim/ Purpose/ Topic/ Content/ Concepts/ Skills (WHAT am I going to teach/ guide/ support…) Definition of frame structures. - Purpose of structural members (components) in wood and steel roof trusses (king and queen post, strut, tie, rafter, tie beam). - Learners identify structural members and type of force (shear, torsion, tension, compression) acting on them in given frame structures. - The use of internal cross-bracing and triangulation to provide stiffness. TEACHERS • Structural members under tension/compression (worksheet). Structural members 2 and 3 Teaching Methodologies & Classroom Management Skills (WHAT am I going to use to teach/ guide/ support…) (HOW am I going to teach/ guide/ support…) • Case study: Electrical pylons – use pictures of a range of pylon designs noting: - The variety of designs that solve the same problem effectively. WEEK Educator read and discuss the content. Explain new vocabulary and terminology. Do the activity together as a class. Educator guide learners through the steps and explains the concepts. Teacher could develop a Worksheet and learners complete Teacher introduce the FAT Resources/ LTSM Paperbased Resources Each learner receives a copy of the notes and the activity. Pages 1 to 4 Digital Resources www.youtub e.com/watch ?v=l6oyuw4V CsU www.youtub e.com/watch ?v=M2mov38 DobM www.youtub e.com/watch ?v=f_yPXLcj2B 8 • Structures that span over space: - Beams: steel I-beams (girders), concrete lintels; beam and column bridge. - Alternative bridge supports: suspension bridges; cable-stayed bridges. - Arches: arches in buildings, bridges, dam walls. www.youtub e.com/watch ?v=JpN6GAo uo2Q - Cantilevers: simple cantilever, cable stayed cantilever. Structural failure – the three most likely ways structures fail are: - Fracture of a member – due to lack of strength. - Bending (flexing, buckling) – due to lack of stiffness (rigidity). - Toppling over – due to lack of stability (top heavy, narrow base). www.youtub e.com/watch ?v=aKWKpZyi DlY 1|P a g e PARENTS LEARNER Informal / Formal Assessment s Values Taught • • • Child reads through the content. Parent and child discuss. Explain new vocabulary and terminology. Discuss the world of work and ask child to think of more jobs where Technology is used. Do the activity together. Guiding your child through the steps of the content and design process. Learners participate in the discussion. Learners complete the activity on page 3 and 4. The focus is on structures, forces, investigate and design. This should be done together as a class. Possible examples include as well as the PAT 1 acknowledgement, attentiveness, neatness, reflection, creativity, design awareness Define frame structures by studying the drawings below. - Purpose of structural members (components) in wood and steel roof trusses (king and queen post, strut, tie, rafter, tie beam). Identify the type and purpose of the different structural members above? 2|P a g e - Identify the type of force (shear, torsion, tension, compression) acting on frame structures. • Case study: Electrical pylons – use pictures of a range of pylon designs noting: - What is function of pylons? - What strengthening techniques are used in the pictures to provide stiffness? • Identify the forces of tension/compression 3|P a g e Structural members • Structures that span over space: - Beams: steel I-beams (girders), concrete lintels; beam and column bridge. Alternative bridge supports: suspension bridges; cable-stayed bridges. 4|P a g e - Arches: arches in buildings, bridges, dam walls. - Cantilevers: simple cantilever, cable stayed cantilever. Structural failure – the three most likely ways structures fail are: - Fracture of a member – due to lack of strength. 5|P a g e - Bending (flexing, buckling) – due to lack of stiffness (rigidity). - Toppling over – due to lack of stability (top heavy, narrow base). 6|P a g e Practical Assessment Task Guidelines Total: 70 Marks This document is a guideline that educators can use to set their own assessment task for term 1. Over the next four weeks learners will investigate and design a model of a machine that can crush grains like maize or wheat to make flour. They can start the task after the first week. Each week learners can complete a part of the PAT, as the concepts or skills are covered in class. In this way learners will have more time to complete the PAT. Name Investigate (30 Marks) Design (40 Marks) Possible mark Investigation 15 Design brief, Specifications and constraints 15 Sketches of possible ideas - Make a 3D isometric projection of the idea with dimensions and drawn to scale Make a working drawing in 2D showing one view with dimensions and line types. Communicate: a sketch enhanced using two of colour, texture or shading TOTAL Learner’s mark 16 20 4 70 POSSIBLE SCENARIO How do maize become maize meal? Before machines were invented to grind or crush the seeds, it took a lot of hard work to make maize meal. Think about the following: How strong and stable the structure should be? What materials and tools do you need to make the structure? How easy will it be to make the structure? How hard and fast will the pestle hit the floor? What is the mechanical advantage of the lever? 7|P a g e A family or a community or a business wants you to make meal or flour from maize, wheat or another grain. They want a quick and easy way to make the meal or flour that does not require a lot of hard work. INVESTIGATE [15] 1. Evaluate: learners examine information on several complex structures and list advantages and disadvantages in the designs Look at: The shape and length of the levers and the pestles The mechanisms that move the beams up and down How strong and stable the structure is How the different parts are assembled? 1.1 Which ideas or aspects of the ideas will you use in your own design? Explain why ………………………………………………………………………………………………………………………………………………………… [4] 8|P a g e Complete the table. Pay special attention to the last two rows of the table on advantages and disadvantages DESIGN A DESIGN B [11] DESIGN C Strength and stability of structure Materials and tools needed How easy to make? How hard and fast will the pestle hit the floor? Mechanical advantage of lever Advantages Disadvantages DESIGN BRIEF, SPECIFICATIONS and CONSTRAINTS [15] 2. Identify the design aspects: a. What is it? (what is needed?) b. Who it is for? (Target) c. What it is for? (Function) 9|P a g e 3. By making use of the above design aspects, complete the… DESIGN BRIEF. (5) I am going to design a ………………………… (what is needed) for a ………………………………………………………. (who is it for) that …………………………………………………………………………………. (what is it for). 4. LIST SPECIFICATIONS. (5) What different mechanisms could make the grain crusher work? What forces should the structure be able to withstand? Do I have to work according a budget? Etc. a. … b. … c. … d. … e. … 5. List the constraints. (5) How much time do I have to design and make the model? What materials can I find easily to build the model? What tools do I already have with which I can make the model? Etc. a. … b. … c. … d. … e. … 10 | P a g e 6. DESIGN ( POSSIBLE IDEAS ) DO AFTER THE SKILLS MENTIONED IN WEEK 4 & 5 WERE ADDRESSED [40] 6.1 Sketch possible ideas you plan to make [ not for marks ] 6.2 Make: a 3D isometric projection of the idea with dimensions and drawn to scale [16] DO AFTER THE SKILLS MENTIONED IN WEEK 4 & 5 WERE ADDRESSED Example of an Assessment rubric for the isometric drawing Drawn to scale and scale is indicated Dimensioning done neatly and correctly Line quality (Dark outlines, light construction lines) Neatness and accuracy of the drawing Total Good 4 Adequate 3 Elementary 2 Poor 1 / 16 Good - al aspects are correctly done Adequate – most of the aspects are correctly done Elementary – a third of the criteria is met Poor – less than a third of the criteria is met 11 | P a g e 6.3 Make: a working drawing in 2D showing one view with dimensions. Example of an Assessment rubric for the working drawing Wrote a heading and indicated scale Drawn to scale and scale is indicated Dimensioning done neatly and correctly Line quality (Dark outlines, light construction lines) Neatness and accuracy of the drawing Total Good 4 [20] Adequate 3 Elementary 2 Poor 1 / 20 4 - Good - al aspects are correctly done 3 - Adequate – most of the aspects are correctly done 2 - Elementary – a third of the criteria is met 1 - Poor – less than a third of the criteria is met 6.4 Communicate: a sketch enhanced using two of colour, texture or shading [4] DO AFTER THE SKILLS MENTIONED IN WEEK 4 & 5 WERE ADDRESSED 4 - Good - enhancing techniques are correctly done 3 - Adequate – Most of the enhancing techniques are correctly done 2 - Elementary – a third of the enhancing techniques is met 1 - Poor – less than a third of the enhancing techniques is met 12 | P a g e