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Warm-Up, 08.26.2009 (15 mins) Why is the scientific method important? Can you think of anything the scientific method can’t do? Why is it important that scientists (and people in everyday life) be as accurate as possible? What do you think life was like before systems of measurement were invented?
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Announcements By now you should have turned in: Lab Safety Sheet (signed) Class Rules/Syllabus (signed) By the end of today you should have: 3 warm-ups & 3 wrap-ups Your binder and dividers
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Today’s Objectives Students will be able to: Understand how to measure and estimate lengths Become more aware of linear measurements in the world and communicate better about the significance of these measurements. Understand the importance of measurement in science. Understand the relative sizes of things using scientific notation.
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Metric Conversions Ladder Method T. Trimpe 2008 http://sciencespot.net/
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1 2 3 MetersLitersGrams How do you use the “ladder” method? 1st – Determine your starting point. 2nd – Count the “jumps” to your ending point. 3rd – Move the decimal the same number of jumps in the same direction. Starting Point Ending Point __. __. __. 2 3 1 Ladder Method KILO1000Units HECTO100Units DEKA10Units DECI0.1Unit CENTI0.01Unit MILLI0.001Unit 4 km = _________ m How many jumps does it take? 4. = 4000 m
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Scientific Notation A short-hand way of writing large numbers without writing all of the zeros.
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The Distance From the Sun to the Earth 93,000,000
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Step 1 Move decimal left Leave only one number in front of decimal 93,000,000 = 9.3000000
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Step 2 Write number without zeros 93,000,000 = 9.3
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7 93,000,000 = 9.3 x 10 Step 3 Count how many places you moved decimal Make that your power of ten
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The power of ten is 7 because the decimal moved 7 places. 7 93,000,000 = 9.3 x 10
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93,000,000 --- Standard Form 9.3 x 107 --- Scientific Notation
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Powers of Ten - Video I need a two volunteers for after the video One will write out the size of the smallest thing we know about. One will write out the size of the largest thing we know about.
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Wrap-Up If you had one wish, what would it be and why? You can’t wish for more wishes, by the way. What did we learn today? What is due next class?
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