1. What is science?

2. Science is the organized search for the truth
We ask questions and try to find the answers
Why do we have seasons?
Where will an earthquake occur?
How do cancer cells grow?
What am I allergic to?
What happens if I mix two chemicals together?
Why do I need to wear a seatbelt?
Why are pandas endangered?

3. Look at these questions

4. You can make a hypothesis (an educated guess) but you can’t stop there.
How will you support your hypothesis? What is your evidence?

5. To support your hypothesis, you will need data or evidence.
To collect evidence, you will need to use the proper tools.

6. Which of the following is the best instrument to use to answer our questions?

7. Why did you choose a ruler?
Rulers are used to measure length.
T. Trimpe

8. Length
The distance between two points

9. Which type of ruler should we use?

10. The Meter Originally defined as a physical quantity of nature.
1/10,000,000 of the distance from the equator to the pole.
Section 1.4

11. The Meter
The meter is now defined by the distance light travels in a vacuum/time.
Section 1.4

12. Length
British Standard Unit = Foot, originally referenced to the human foot.
Why is this a problem?
What happens to that measurement when a new “ruler” is crowned?
Section 1.4

13. Metric makes calculations and measurements much easier!

14. We use metric measurements in science class.
Why?
It’s easier to convert (m to cm vs. yards to feet) – no fractions!
- More countries use it!
Non-metric countries: USA, Myanmar, Liberia

15. Measure Carefully and Always use Metric!

16. The Metric System

17. So how do I use a metric ruler?
Metric rulers are divided into centimeters and millimeters.
10mm = 1 cm
100 cm = 1 m

18. Step 1:  You must align the left edge of the ruler with the left edge of the object you are measuring.
Step 2:   Look at the ruler and count the number of centimeters of the object shown.  
Answer: The length is 6.8 cm or 68 mm

19. Measuring Length How many millimeters are in 1 centimeter?
1 centimeter = 10 millimeters
What is the length of the line in centimeters? _______cm
What is the length of the line in millimeters? _____ mm
What is the length of the line to the nearest centimeter? ________cm
HINT: Round to the nearest centimeter – no decimals.
2.8 28 3
Ruler:

20. Try it!
How long is your paper?
In cm?
In mm?
How wide is your paper?

21. Look at these questions
Form a hypothesis:
Which line segment is longer? _______
Which person is taller? _________
Collect some data
Form a conclusion and support your answer.

22. Are the gray horizontal lines parallel or do they curve?
How will you support your hypothesis?

24. Metric Videos https://www.youtube.com/watch?v=7bUVjJWA6Vw
Origins of metric system
Why doesn’t the US convert to metric
Its time to switch DNews