Presentation on theme: "Bell-Ringer! Without using a measuring device, with 2 partners measure the width of one of the black tables (center of the room). Time: 4 minutes Write."— Presentation transcript:
1Bell-Ringer!Without using a measuring device, with 2 partners measure the width of one of the black tables (center of the room).Time: 4 minutesWrite your answer on a white board.
4Measuring is impossible without the use of a ___________. A __________ is an exact quantity that people agree to use for comparison.A measurement must contain 2 parts:A quantity (number)A unit (refers you to the specific standard)What type of standards do we use?standardstandard
5Measuring Systems English Developed in Medieval Europe as a combination of Roman and Anglo-Saxon termsUsed in US todayMetricDeveloped in 1700s
6International System of Units: SI Uses an improved metric systemEach type of measurement has a base unit.
7Length: the distance between 2 points. Volume: amount of space an object occupies.Mass: amount of matter in an object.Time: interval between 2 events
8Practical Application: How do we measure the distance to the moon? In 1970s astronauts placed light reflectors on the moon.Lasers on Earth aimed at the reflectors and the time it took for the light to go from EarthMoonEarth was recorded.Compared to the speed of light 3x108m/s.Distance to moon = 378,000,000 m
9Other measurements:The speed of light is 3x108m/s. This unit is not on the table.Derived units: obtained by combining units on the table.Speed (length ∕ time)Area (length x width)Volume (length x width x height)Density (mass/volume)
10Temperature The SI unit of temperature is Kelvin (K). Most scientific work is measured on the Celsius scale except for work at extreme temperatures.To convert:0C = K