Day 1: Intro to Physical Science Metric Introduction Metrics: Length

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Presentation transcript:

Day 1: Intro to Physical Science Metric Introduction Metrics: Length The ABC’s of Science Day 1: Intro to Physical Science Metric Introduction Metrics: Length

Let’s talk Metric Here in America we use ye olde English system: foot, yard, and mile. However, MOST countries use another system called the International System of Units or the SI system (which stands for Système Internationale d’Unités) This is the modern form of the metric system.

It all depends on the foot! Numbers and units are used to make measurements. The distance from your desk to my desk could be 25 shoe lengths or 30 shoe lengths. It depends on how big the shoe is. Think of Shaq’s foot versus Mini-Me.

It all depends on the foot! In order to measure accurately, we have to use standard units. In other words, everyone has to use the SAME system or units. Otherwise, it just gets confusing. A standard is a fixed quantity used by everyone when measuring.

Advantages to the Metric System There are two advantages to using the metric system: It helps scientists share & compare their results & observations. If I conducted an experiment here in America, even a scientist in Zimbabwe would be able to understand my measurements. All units are based on the number 10. Changing from one unit to another is easy!

1. Metric Measurement

Math-terpiece Theater BrainPop: Metric vs. Customary go to http://www.brainpop.com BEFORE 5PM log in: MMS308 password: marshall

Part 2: the UNIT Here are some of the most important units, and you need to memorize these too. What are we measuring? Unit Symbol Length Volume Mass Temperature meter liter gram Kelvin m l g K

Try this… 1 kilometer is equal to _1000___ meters. prefix = kilo or 1000 unit = meter, measuring distance Therefore: 1 kilometer = 1000 meters. 5 kilometers is equal to _______ meters 5 x 1000 meters = 5,000 meters 10 kilometers is equal to _______ meters 10 x 1000 meters = 10,000 meters Later, we’ll practice converting from one to another.

Try this… What unit would you use to measure each of the following? Water in a bottle Liter The distance from my classroom to the bathroom Meter The amount of heat in the classroom? Kelvin or Celsius How much matter is in a paperclip Gram

2. If only American Chopper used the metric system…

Metric System: Length The meter (m) is the SI unit of length. A meter is about the distance from a doorknob to the floor. A driver golf club is also about a meter in length. The meter is divided into 100 equal parts called centimeters (cm). There are 100 centimeters in a meter: 100 cm = 1 m

An even smaller unit is a millimeter (mm). The prefix “milli-” means 1/1000, so… 1000 mm = 1 m 10 mm = 1 cm

Long distances are measured in kilometers (km). In the US, we measure speed by miles per hour (mph). In most other countries, they measure in kilometers per hour (km/h).

You try it! Name 3 things that are about one meter long. Golf Club, Chair, Flag, 6th graders… Name 3 things that are measured in centimeters Paperclips, babies, toes, fingernail Name 3 things that are small enough to be measured in millimeters Camera film, pencil lead, wire diameter, insects

You Try It! Arrows A, B, & C are all pointing to a particular place on a meter stick. Name the value & include units. Point A = 49.4 cm or 494 mm Point B = 50.5 cm or 505 mm Point C = 52.0 cm or 520 mm

Distance from San Diego to New York You try it! What is the most appropriate unit for a scientist to use to measure the following? Distance from San Diego to New York km Length of your eyelash mm Distance from A306 to the office m Length of your arm cm Height of this building m Length of a grain of salt m

You try it! Practice Measuring Measure the length of this paper in cm & mm. _______ cm & _______ mm Draw a square with sides measuring 11cm. Measure the height of your desk from the floor to the top in meters & centimeters. _______ cm & _______ m Measure the length of your desk in meters & cm.