Lesson Notes By Weeks and Term v5 - Grade 10

Lesson Video

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Performance objectives

• Apply knowledge of workshop safety procedures.
• Calculate properties of simple machines (levers, pulleys).
• Describe different types of engineering materials.
• Explain the principles of basic hand and power tools.
• Sketch and interpret basic engineering drawings.

Lesson summary

This week focuses on consolidating your understanding of key concepts in Mechanical Technology covered so far this term, specifically for examination preparation. Mechanical Technology is crucial because it provides the foundational knowledge and skills for various industries vital to the South African economy, such as manufacturing, automotive, mining, and construction. A strong grasp of these concepts allows you to understand how things are made, how they work, and how they can be improved. This week, we'll practice applying these concepts to solve problems, improving your readiness for the upcoming assessments.

Lesson notes

2.1 Workshop Safety Safety in the workshop is paramount. Always remember the potential hazards present, and follow procedures to mitigate risks.

These include: Personal Protective Equipment (PPE): Always wear appropriate PPE, including safety glasses, overalls, closed-toe shoes, and hearing protection when necessary. No loose clothing or jewelry should be worn.

Housekeeping: Keep the workshop clean and tidy. Clean up spills immediately to prevent slips and falls. Tools should be stored properly after use.

Machine Guards: Ensure that all machine guards are in place and functioning correctly before operating any machine. Never bypass or remove safety guards.

Emergency Procedures: Know the location of first aid kits, fire extinguishers, and emergency exits. Understand the procedures for reporting accidents and injuries.

Tool Safety: Use tools correctly and for their intended purpose. Inspect tools for damage before use. Never use dull or damaged tools.

Electrical Safety: Ensure electrical cords and equipment are in good condition. Avoid using electrical equipment in wet areas.

Example: Identify potential safety hazards in a workshop where a student is grinding metal without safety glasses, and the floor is covered in metal shavings.

Answer: The student is at risk of eye injury from flying metal particles. The metal shavings on the floor pose a slip hazard. 2.2 Simple Machines Simple machines are devices that make work easier by multiplying force or changing its direction.

Mechanical Advantage (MA): The ratio of the load force (output force) to the effort force (input force). MA = Load/Effort. A mechanical advantage greater than 1 means the machine multiplies force.

Velocity Ratio (VR): The ratio of the distance moved by the effort to the distance moved by the load. VR = Distance moved by effort / Distance moved by load. VR is determined purely by the geometry of the machine. Efficiency (η): The ratio of the work output to the work input. Efficiency is always less than 1 (or 100%) due to friction and other losses. η = (Work Output / Work Input) x 100% = (MA/VR) x 100%.