Science and Measurement Chapter 1.2 The Foundations of Physical Science

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

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 1 min

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

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

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.