1. Measurements

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

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

4. 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)

5. 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

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

7. 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

8. 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!

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

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

11. Try measuring here

12. Try measuring here:
2.37 cm

13. Measuring Length correctly
You get to guess one number.

14. How about this one?

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

17. Triple Beam Balance

19. Metric Conversions

20. 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

21. 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!!!!

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

23. K H D M d c m

24. Sample Problem
23 cm = ____?____ Dm

25. 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

26. Sample Problem Move the decimal that many places over 23. 0.023 Answer
Answer
23 cm = Dm

27. Another sample
7.8 Km = ____?______dm

28. 7.8 Km = dm

29. Now you try 14 mm = ___________M 2.1 Hm =___________cm
92 M =_____________Km
5.22 Dm =__________dm
0.45 Km = __________mm