1. Units of Measurement
What are some different ways of measuring a person’s height?
There are two major systems of units used today.
Which one do we use in the United States?
Scientist have developed an International System of Measurements (SI), so that every one will use the same units of measurements, making sharing data results easier.

2. 7 basic metric units Quantity Metric System British System Length Mass
Time
Temperature
Electric Current
Amount of Substance
Luminous Intensity

3. Metric Prefixes Prefix Symbol Meaning Multiple giga mega kilo deca
deci
centi
milli
micro
nano

4. Derived Units
Derived units are combinations of the seven basic units and are used to describe other measured quantities in nature.
How do you measure the speed of a car on the highway?
What are some examples of other derived units?

5. Density
Density is a common derived unit comparing the mass and volume of an object.
What is the equation for density?

6. Density
Two blocks are on a table. Block A has a volume of 30.0 cm3 and a mass of 81.0 g. Block B has a volume of 50.0 cm3 and a mass of 135 g. Which block has the greater density?
What would the volume be of a third block that has a mass of 23.0 g if it has the same density as block B?

7. Conversions
kilo
hecto
deca
Base Unit (1)
deci
centi
milli k h da
Meter (m) d c m
1000
100 10
Gram (g)
0.1
0.01
.001
103
102
101
Liter (l)
10-1
10-2
10-3
Move the decimal point to the left or right to convert within the metric system.
If you are going from a smaller unit to a larger unit move the decimal to the left.
If you are going from a larger unit to a smaller unit move the decimal to the right.

8. Metric Conversions 245 m = _____________ cm 305 kg = _____________ g
35 mm = ______________ m
1250 cm = _____________ m
358 ml = ______________ l
2350 g = ______________kg
35 dm = ______________m
67 hm = ______________m

9. Factor Label Conversions
A football field is 100 yards long. How long is that in meters?
A horse can gallop at a speed of 42.0 mph. How fast can the horse gallop in m/s?

10. Examples
If I were to hit a home run down the left side of Jacobs Field the ball would have to travel at least 325 ft. How far is that in meters?
The top speed of a human is 10.4 m/s. How fast is that in mph?

11. Examples
A race car can travel around 225 mph. How fast is that in m/s?

12. Examples
Gold has a density of g/cm3. What is its density in lbs/in3 ?