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JAMSASC
Sunday, November 2, 2014
Tuesday, September 16, 2014
Thursday, February 20, 2014
Significant Figures
Topic: Significant Figures
Specific Objectives: Students should be able to :
1. State the number of significant figures in a number.
2. Express a number to a given number of significant figures.
Strategies: Discussion, Classwork, Demonstration, Video.
Teaching Aids: Overhead Projector, IBT
Instructional Materials: PowerPoint Presentation, CXC/CSEC Physics Textbook
Presentation: In Physics significant figures are a representation of the precision of a measuring instrument, therefore 2.0 and 2.00 taken as readings from 2 different instruments suggest that 2.00 was taken using an instrument of greater precision.
Development and summary of lesson: The lesson will be in the form of a discussion/lecture. The lesson will begin with the teacher giving a summary of what will be done in class. The teacher will discuss the importance of significant figures in physics. Students will then be shown two videos from Youtube on how to determine significant figures. Two examples will be done to show how we round off numbers to a given number of significant figures. The students will then be asked to give answers to similar examples. The lesson will continue with the teacher going through the different rules governing how the number of significant figures in a number is determined. Several examples of the different cases will be done and the teacher will then give the students some questions to do on their own.
Evaluation of Lesson and assignment given: Questions will be set to test the students understanding of what was done. The students work will be collected and marked and the answers discussed at a later date.
Significant Figures - Rules
Significant figures are critical when reporting scientific data because they give the reader an idea of how well you could actually measure/report your data. Before looking at a few examples, let's summarize the rules for significant figures.
- 1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS significant.
- 2) ALL zeroes between non-zero numbers are ALWAYS significant.
- 3) ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at the end of the number are ALWAYS significant.
- 4) ALL zeroes which are to the left of a written decimal point and are in a number >= 10 are ALWAYS significant.
Notes: Significant Figures
JAMSASC
EXCEL BEYOND EXPECTATIONS CXC/CSECPhysical Quantities and Units
Subject: Physics
Topic: Physical Quantities and Units
Specific Objectives: Students should be able to:
1. Recall the fundamental Quantities of the international system and their related symbols.
2. Recall the base units for the fundamental quantities in the SI system and their related symbols.
3. Explain the need for standard units in measurement.
Teaching strategies: Discussion, Classwork, Lecture, video, demonstration.
Instructional Materials: Syllabus, Physics textbook
Lesson Introduction: The SI is a system of units used in physics. There are seven basic quantities having seven basic units and these are used to derive all other quantities.
Development and summary of lesson: The SI system will be discussed and students will be given the different quantities and units that are taken as basic. The symbols used for the quantities and units will also be given in tabular form.
The need for using these standard units will be discussed as well as problems that may arise when using non-standard units.
Evaluation Of lesson: At the end of the lesson, question will be given to the students to test how well they understand the concepts taught.
THE SI SYSTEM
The SI system (International System of Units) is the modern metric system of measurement and the dominant system of international commerce and trade. SI units are gradually replacing Imperial and USCS units.
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Derive Units
Derived units are algebraic combinations of the seven base units and the two supplementary units with some of the combinations being assigned special names and symbols.
JAMSASC
EXCEL BEYOND EXPECTATIONS CXC/CSEC
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