What is science Science is the organized search

What is science?

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?

Look at these questions

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

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

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

Why did you choose a ruler? • Rulers are used to measure length. T. Trimpe 2008 http: //sciencespot. net/

Length • The distance between two points

Which type of ruler should we use?

The Meter Originally defined as a physical quantity of nature. 1/10, 000 of the distance from the equator to the pole. Section 1. 4

The Meter The meter is now defined by the distance light travels in a vacuum/time. Section 1. 4

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

Metric makes calculations and measurements much easier!

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

Measure Carefully and Always use Metric! http: //www. cse. lehigh. edu/~gtan/bug/local. Copies/mars. Orbiter

The Metric System

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

• 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

Measuring Length How many millimeters are in 1 centimeter? 1 centimeter = 10 millimeters 2. 8 What is the length of the line in centimeters? _______cm What is the length of the line in millimeters? 28 mm _____ 3 What is the length of the line to the nearest centimeter? ____cm HINT: Round to the nearest centimeter – no decimals. Ruler: http: //www. k 12 math. com/math-concepts/measurement/ruler-cm. jpg

Try it! • How long is your paper? – In cm? – In mm? • How wide is your paper? – In cm? – In mm?

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.

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

Metric Videos https: //www. youtube. com/watch? v=7 b. UVj. JWA 6 Vw Origins of metric system https: //www. youtube. com/watch? v=iz. KHWPxx. TYA Why doesn’t the US convert to metric https: //www. youtube. com/watch? v=gdmz 3 O 2 ln. MQ Its time to switch DNews