MESUREMENTS

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n What is a physical quantity? n Examples of physical quantities    n What are not examples of physical quantities? n List of prefixes    n Size matters __ Vernier Caliper __

__ Flash Micrometer __

**Measuring instruments**
• What do we mean by precision of an instrument? • What are the two errors mentioned in the book? • What are the two instruments mentioned in the book? **Task 1: Do we really need an international system of units?**  You are to write an essay based on the above title. You will be graded on Criterion A (One World) and criterion B (Communication) for this task. You are to use the SWOT analysis given to you to help you with drafting the contents of your essay. You should also use the Marking Criteria to help you to achieve a high level of competency in each criterion. You have 2 weeks to write this essay and submit it online at ilearn.ssis.asia at your respective classes. Please note the following for your online submission:

1) Microsoft Word 2003 2) Single line spacing 3) Font size 12 Times New Roman 4) About 500 words ( 1 page) Deadline: Deadline: S3Pearl: 27 September 2010 S3Ivory: 28 September 2010 S3Amber: 28 September 2010 S3 Ruby: 29 September 2010 Date of this document: 12 September 2010 Guideline for plotting graph

What does the word kinematics mean?

n What is the definition of speed? n What is the formula for average speed? n Is the word “average” important? n General knowledge: how fast are the things around us? n What information can I get from a distance-time graph? n [] n How can we know the instantaneous speed of an object? l Recognise graphs of Acceleration: l Uniform l Decreasing l Increasing l Positive l Negative l Area under a speed-time graph __ __

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Investigation on Density Forces Density quiz