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Measurements

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**Units Units Unit- what we measure something in Example 32 feet**

85 seconds 0.004 lbs 98.6˚F 0.6 m Units

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**Check yourself Which of the following are units? meters dollars feet**

time kilograms miles length temperature hours

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**SI Units What scientists (and almost everybody else) uses**

Our Units (what we use) SI Units (what everyone else uses) Length Feet (ft) Meters (m) Time Seconds (s) Weight (how much gravity pulls us down) Pounds (lbs) Newtons (N) Mass (how much stuff there is in an object) Kilograms (kg)

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**Measuring length Meter stick Larger than a meter stick**

1000 meter sticks= 1 km Smaller than a meter stick 1 meter= 100 cm Even smaller 1 meter= 1000 mm

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**Joe owns his own company**

He needs 1200 gold pieces just this length for his new invention

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**He does a quick measurement and writes down the length as 3.5 cm.**

His: 3.5 cm Real: 3.42 cm Difference of 0.08 cm

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**Oops! His quick measurement: 3.5 cm Real: 3.42 cm**

Difference of 0.08 cm If he orders 1200 pieces, each 3.5 cm…. 96 extra cm 5 dollars an inch? = $188.98 Measuring properly is important!

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Measuring 1 2 3 4 5 6 7 8 9 10 You can guess one number.

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Measuring 1 2 3 4 5 6 7 8 9 10 You can guess one number. 7.6 cm

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Try measuring here

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Try measuring here: 2.37 cm

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**Measuring Length correctly**

You get to guess one number.

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How about this one?

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**MASS How much stuff an object has NOT how much an object weighs**

Mass is measured in kilograms (kg).

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Triple Beam Balance

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Metric Conversions

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**King Henry Died Monday drinking chocolate milk**

Memorize this In order to make metric conversions we need to know our conversion factors. We will need to memorize our conversion factors for metrics. We can do this with the following pneumonic device: King Henry Died Monday drinking chocolate milk

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**What does that mean? King Henry Died Monday drinking chocolate milk**

Kilo Hecto Deca Meter deci centi mili NOTICE THAT THE WORDS AFTER METER ARE NOT CAPITALIZED!!!!

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Sample Problem 23 cm = ____?____ Dm We will use stair steps to make our conversions

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K H D M d c m

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Sample Problem 23 cm = ____?____ Dm

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23 cm = ____?____ Dm K Put a decimal in front of the number if there isn’t one already. 23. cm 2. Find the starting point. 3. Count the number of steps to get to the ending point. H 3 D chocolate M 2 d 1 c m

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**Sample Problem Move the decimal that many places over 23. 0.023 Answer**

Answer 23 cm = Dm

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Another sample 7.8 Km = ____?______dm

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7.8 Km = dm

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**Now you try 14 mm = ___________M 2.1 Hm =___________cm**

92 M =_____________Km 5.22 Dm =__________dm 0.45 Km = __________mm

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Metrics The scientific units of measurement. Why do scientists use metric units? Easy to use Based on the decimal system (each unit is 10 times larger.

Metrics The scientific units of measurement. Why do scientists use metric units? Easy to use Based on the decimal system (each unit is 10 times larger.

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