Post on 19-Jun-2015
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?
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
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.
Measurement
Baby turtle!!!!!!!!!!!!!omg!!!!!!!!!!
Bill Nye - Measurement
Bill Nye the Science Guy - Measurement
Metric Conversions Ladder Method
T. Trimpe 2008 http://sciencespot.net/
KILO1000Units
HECTO100
Units
DEKA10
UnitsDECI
0.1Unit
CENTI0.01Unit
MILLI0.001Unit
MetersLitersGrams
Ladder Method
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.
4 km = _________ m
12
3
How many jumps does it take?
Starting Point Ending Point
4.1
__.2
__.3
__. = 4000 m
Measurement Unit Tool
length meter, cm, km, light year
Ruler, meter stick, yard stick
volume Liter, mL, cubic centimeter
Graduated cylinder, beaker
mass Gram, kilogram, milligram
Triple-beam balance
weight Newton Weighing scale
density D=M/V
temperature Celsius thermometer
Scientific Notation
A short-hand way of writinglarge numbers without writing all of the zeros.
The Distance From the Sun to the Earth
93,000,000
Step 1
• Move decimal left• Leave only one number in front of decimal
Step 2
• Write number without zeros
Step 3
• Count how many places you moved decimal• Make that your power of ten
The power often is 7 becausethe decimalmoved 7 places.
• 93,000,000 --- Standard Form
• 9.3 x 107 --- Scientific Notation
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.
The largest “thing” currently known
The smallest measurable “thing” currently known
Discovering even smaller particles….
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?
Metric System Scavenger Hunt