AS/A Physics | Units And Dimensions | Lesson plan

# Schedule

July 17 - Jul 30 (2 weeks)

# Content

- History of the units system
- Features of a good unit system
- The FPS, CGS and MKS systems
- The SI system
- Basic and derived units
- Prefixes
- Inter system conversions
- Dimensional analysis

# Instructional objectives

Students should be able to:

- understand the importance of having a good unit system
- understand the qualities of a good unit system
- convert between different unit systems
- understand how to obtain derived units from basic units
- recollect all the basic units used in the SI system
- learn to use frifixes such as micro nano mega etc to scale the units
- Analyze the dimensions in an equation to look for mistakes
- Derive simple equations using dimensional analysis

# Teaching Process

- Make them come up with their own ways of defining units and identify the aspects of a good unit system
- Make them solve problems of converting between different unit systems
- Derive equations using dimensional analysis

# Activities

- experimentally determining constants of dimensional analysis

# Suggested reading / References

- For the history of the modern unit system which began as the CGS system [http://en.wikipedia.org/wiki/Centimetre%E2%80%93gram%E2%80%93second_system_of_units]
- http://en.wikipedia.org/wiki/Dimensional_analysis
- On units dimensions, scaling and measurement Lewin's mechanics lecture 8.01
- A more generalized form of deriving equations using dimensional analysis [https://www.youtube.com/watch?v=3gxNrc_EEN8]

# Assignments/evaluation

- Assignments on dimensional analysis
- Written test