Technology Lesson Plan on Cogs and Gears
- SCIENCE -
TECHNOLOGY SIMPLE MACHINES: Cogs & Wheels
ACHIEVEMENT OBJECTIVES:
1) Explore everyday examples of physical phenomena such as movement and forces.
2) Investigate a context to develop ideas for potential outcomes and evaluate against the criteria.
SPECIFIC LEARNING OBJECTIVES:
Students will be able to:
i) Experiment with, and demonstrate that, even-numbered intersecting cogs reverse the rotation of the original spin direction.
ii) Experiment with, and demonstrate that, odd-numbered intersecting cogs retain the original spin direction.
i) Experiment with, and demonstrate that different sized intersecting cogs will either increase or decrease the rotational speed of the driven cog depending on their position.
i) Apply the knowledge learnt when designing their own inventions.
LEARNING ACTIVITIES:
1) General discussion of the vocabulary we will be using throughout the unit. Cogs, teeth, clockwise, anti-clockwise, gears, odd, even, speed, rotation, spin.
2) Demonstration with the "Wacky Factory" plastic wheels of the specific learning objectives above.
3) Students will experiment with odd and even-numbers of cogs to discover and demonstrate the change of rotational direction.
4) Students will experiment with a variety of different sized cogs with a variety of teeth to discover and demonstrate that different combinations alter the speed of the rotation.
5) Students will be encouraged to participate in group and class discussions and demonstrations.
6) Students will use the knowledge and understandings from class lessons in their own inventions.
ASSESSMENT:
1) FORMATIVE:
i) Teacher observation during experimentation with apparatus.
ii) Teacher observation during group and class discussions.
iii) Teacher observation of application of knowledge.
2) SUMMATIVE:
i) Students will complete a worksheet to assess their understanding of the two specific learning objectives and their relevance to the technological world around them.
ii) Self/peer assessment of personal inventions.
RESOURCES: New beer bottle tops, milk bottle tops with pre-drilled holes, shortened glass pins, pre-cut MDF boards, egg beater whisk, can opener, wind turbine, plastic whirly-gigs.
REFLECTION:
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Related Tags: education, science, teeth, power, machines, physics, mechanics, wheels, windmills, forces, wind turbines, rotation, cogs, gearslesson plan, intersecting
Retired Principal originally from England but now resident in New Zealand for the past 55yrs
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