Measurements.

Presentation on theme: "Measurements."— Presentation transcript:

Measurements

Units Units Unit- what we measure something in Example 32 feet
85 seconds 0.004 lbs 98.6˚F 0.6 m Units

Check yourself Which of the following are units? meters dollars feet
time kilograms miles length temperature hours

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)

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

Joe owns his own company
He needs 1200 gold pieces just this length for his new invention

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

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!

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

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

Try measuring here

Try measuring here: 2.37 cm

Measuring Length correctly
You get to guess one number.

MASS How much stuff an object has NOT how much an object weighs
Mass is measured in kilograms (kg).

Triple Beam Balance

Metric Conversions

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

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!!!!

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

K H D M d c m

Sample Problem 23 cm = ____?____ Dm

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

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