Physics

The science that deals with the relationship between matter and

energy.

Measurement

Quantity

Something that can be measured such as…

temperature, volume, length, mass.

Measurement

Consists of a number and units. Examples: 27 ft, 45 liters, 74F.

Standard

An exact quantity that people agree to use for comparison.

SI units

“Le Syste’me Internationale d’ Unite’s” The standard system of measurement used

worldwide.

Dimensional Analysis (Factor-Label Method)

The use of conversion factors and unit-labeled numbers to solve problems.

Conversion Factor

Number used to convert from on unit to another.

Equal to one.

Examples

How many cm are there in 25 m?

25 m 100 cm = 2500 cm

1 m

Examples

How many micrometers is 0.073 cm?

0.073 cm 1 m 1,000,000 m = 730 m

100 cm 1 m

Examples

How many seconds are in one day?

1 day 24 h 60 min 60 s = 86,400 s

1 day 1 h 1 min

Examples

Convert 50 mph to km/s.

50 miles 1.609 km 1 hour = .022 km/s

hour 1 mile 3600 s