Grade 10 Power Mechanics Term 2 Scheme of Work

Power Mechanics • Grade 10

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Week Lesson Strand Sub-strand Lesson Learning Outcomes Learning Experiences Key Inquiry Question(s) Learning Resources Assessment Reflection
1 1 Related Drawing 2.3 Tangency By the end of the lesson, the learner should be able to:
a) describe methods of constructing tangents in technical drawing;
b) explain the geometric principle of perpendicularity at point of contact;
c) appreciate precision in smooth transitions.		 The learners will be guided to:
i> examine gear and cam profiles;
ii> discuss why sharp edges cause stress;
iii> relate tangency to component durability.		 Why must curves meet lines smoothly in engineering? Component samples, diagrams Principle explanation rubric —
1 2 Related Drawing 2.3 Tangency By the end of the lesson, the learner should be able to:
a) construct a tangent from a point to a circle;
b) use compass and straightedge accurately;
c) demonstrate patience in geometric construction.		 The learners will be guided to:
i> follow step-by-step construction;
ii> verify right angle at contact point;
iii> peer-check for smoothness.		 How do you draw a line that just touches a circle? Compass, rulers, drawing paper Construction accuracy rubric —
1 3 Related Drawing 2.3 Tangency By the end of the lesson, the learner should be able to:
a) construct external tangents to two equal circles;
b> apply parallel line method;
c> value symmetry in design.		 The learners will be guided to:
i> draw two same-size circles;
ii> construct upper and lower tangents;
iii> relate to dual-pulley systems.		 How do you connect two circles with a straight line that never crosses between them? Drawing tools, pulley models External tangent rubric —
1 4 Related Drawing 2.3 Tangency By the end of the lesson, the learner should be able to:
a) construct external tangents to two unequal circles;
b> use auxiliary circle method;
c> demonstrate problem-solving in geometry.		 The learners will be guided to:
i> draw circles of different sizes;
ii> apply reduction technique;
iii> verify tangency with ruler.		 How do you connect a small gear to a large one smoothly? Drawing tools, gear diagrams Unequal external tangent rubric —
1 5 Related Drawing 2.3 Tangency By the end of the lesson, the learner should be able to:
a) construct internal tangents to two circles;
b> cross between circles with smooth lines;
c> appreciate complexity in mechanical design.		 The learners will be guided to:
i> construct tangents that cross the line joining centres;
ii> relate to crossed-belt drives;
iii> compare to external tangents.		 When would you need a tangent that crosses between two circles? Belt drive models, drawing paper Internal tangent rubric —

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