Grade 8 Unit D: Curriculum Links |
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Unit D: Mechanical Systems
(Science and Technology emphasis)
Overview:
Machines are used for many purposes in our daily lives, when we need to transfer energy into
motion, or move materials in a controlled way. in learning about mechanical devices, students investigate how components
are linked so that energy is transferred efficiently and desired functions are performed. A comparison of past
and present technologies helps students recognize that different approaches have been used over time to meet common
needs. Evaluation of efficiency, effectiveness and impacts on daily life, the community and the environment are
important considerations in this unit.
Focusing Questions:
How is energy transferred in mechanical devices?
How do they provide for controlled application of energy in ways that are efficient, effective and responsible?
Key Concepts
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- transmission of force and motion
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- speed ratios and force ratios
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- mechanical advantage and hydraulics
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- measurement of work in joules
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STS and Knowledge Outcomes
Students will: Illustrate the development of science
and technology by describing, comparing and interpreting mechanical devices that have been improved over time
Students will: Analyze machines by describing structures and functions
of the overall system, the subsystems and the component parts
Students will: Investigate and describe the transmission of force and
energy between parts of a mechanical system analyze mechanical devices to determine speed ratios and force ratios
Students will: Analyze the social and environmental contexts of science
and technology, as they apply to the development of mechanical device
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