SHS2 Robotics · Semester 2 Week 9: Robot Construction

Lesson notes

Learning Objectives

Indicator: 2.3.2.LI.1 - Discuss closed-chains, velocity and trajectory as they are used in mechanics.

By the end of the lesson, learners can:

Define closed-chain, velocity, and trajectory in their own words and distinguish between them using examples from robot construction.
Explain the difference between average and instantaneous velocity, and compute both from given position and time data.
Calculate average speed, average velocity, and average acceleration for simple robot motion scenarios.
Plot position and velocity against time for a simple trajectory and interpret the shape of the graphs.
Discuss why closed-chain designs (such as the human arm or a four-bar linkage) are useful in robot construction.

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Curriculum details

Strand: Robot Construction and Programming (Strand 3)
Sub-strand: Robot Construction (3.2)
Content standard: 2.3.2.CS.1 - 2.3.2.CS.1 Demonstrate understanding of kinematics of closed-chains, velocity kinematics and trajectory kinematics. 2.3.2.LO.1 Analyse robots with closed-chain designs and formulate navigation equations for traversing specific trajectories.
Indicator: 2.3.2.LI.1 - Discuss closed-chains, velocity and trajectory as they are used in mechanics.
Suggested placement: Semester 2, Week 9 (Week 29 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 120

Exemplars (from the NaCCA curriculum)

Talk for Learning:
- Through questioning, learners discuss the concept and definitions of average position, average velocity, and average acceleration.
- Learners analyse scenarios or narratives and compute average positions, average velocity, and average accelerations from basic quantities or measurements.
- Through questioning, learners discuss the concept and definitions of instantaneous position, velocity, speed, and acceleration. They analyse scenarios or narratives and compute instantaneous position, velocity, speed, and acceleration from basic quantities or measurements, plotting these quantities as a function of time.

Assessment (2.3.2.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.

Teaching and Learning Resources:
- Videos and flip board showing how distance, velocity, acceleration and time are measured
- Videos, real objects presentation using the human arm