Lesson Notes By Weeks and Term v4 - SHS 1
Robot Construction
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Robot Construction
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Subject: Robotics
Class: SHS 1
Term: 2nd Term
Week: 12
Grade code: 1.3.2.LI.2
Strand code: 3
Sub-strand code: 2
Content standard code: 1.3.2.CS.1
Indicator code: 1.3.2.LI.2
Theme: Robot Construction & Programming
Subtheme: Robot Construction
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This lesson introduces the fundamental principles of building strong and stable robot structures. Just like a house needs a solid foundation to stand firm in a storm, a robot needs a well-designed chassis (its frame or skeleton) to perform its tasks without falling apart or tipping over. We will explore how simple shapes, smart design, and an understanding of forces are crucial for any machine. In Ghana, from the design of a sturdy wheelbarrow used on a farm to the construction of the Adomi Bridge, these principles are all around us. Understanding them will empower you to build robots that are effective, reliable, and fit for their purpose.
This section breaks down the core ideas you need to build strong robots. A. What is a Robot Structure (Chassis)?
The structure, often called the chassis or frame, is the robot's skeleton. It is the component that holds everything else together: the motors, sensors, controller (the "brain"), and power source. A good chassis must be: Strong: It must not bend or break under its own weight or the weight of what it carries (its payload). Stable: It must not tip over easily when moving or standing still. Fit for purpose: A robot designed to climb stairs will have a different chassis from one designed to carry a bottle of water on a flat table. B. Stability and Centre of Gravity
Stability is the ability of an object to resist tipping over. The key to stability is the Centre of Gravity (CG). Definition: The Centre of Gravity is the average location of the weight of an object. You can think of it as the single point where the object's weight is concentrated. The Rule of Stability: An object is most stable when its centre of gravity is low and its base of support is wide.
Example from Ghana: Think of a trotro. It is wide and its heaviest parts (engine, axles) are very low to the ground. This gives it a low centre of gravity and makes it very stable. A person carrying a large basin of goods on their head (*kayayo*) must expertly keep the load's centre of gravity directly over their feet (their base of support) to avoid it falling.