1. Science and Measurement
Chapter 1.2
The Foundations of Physical Science

2. Time in Science Time is used in two ways
One way is to identify a particular moment in the past or future
It is just a time of day
This is the way “time” is used in everyday conversation
The second way is to describe a quantity of time
“How much time?”
A time interval is also a quantity of time
Any calculation that you do will involve time intervals not time of day

3. Time in seconds Many problems in science use time in seconds
For calculations, you may need to convert hours and minutes into seconds
How many seconds is this time interval? CONVERT ALL TO SECONDS
2 hr x 60 min x 60 sec = 7200 sec
1 hr min

4. How many seconds is this time interval?
CONVERT ALL TO SECONDS
HOURS: 2 hr x 60 min x 60 sec = 7200 sec
1 hr min
MINUTES: 30 min x 60 sec = 1800 sec
1 min
SECONDS: 45 sec
NOW---ADD THEM ALL UP!!!!
7200 sec sec + 45 sec = 9,045 seconds

5. Distance Distance is the amount of space between two points
Distance is measured in units of length
The English system uses inches, yards, feet, miles
The SI basic distance unit is the meter
Prefixes are added to the name to describe very large or small measurements

6. Meter Prefixes
Prefixes are added to the names of basic SI units such as meter, liter and gram.
Prefixes describe very small or large measurements.