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physics 125

physics 125 - Metric System and Density SAN DIEGO MESA...

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Metric System and Density 1 SAN DIEGO MESA COLLEGE Name_________________________ LAB REPORT Date __________Time___________ Group #: ______________________ Partners ______________________ TITLE: Length, Mass, & Density ______________________________ ______________________________ ______________________________ Objective: In this experiment, you will learn the metric system by performing basic measurement techniques. You will use these techniques to find the density of various objects. Equipment: Balance (0.01g) Wooden Blocks Meter stick and ruler Metal Blocks Irregular-shaped metal object (~ 200 pennies) Graduated Cylinder Peanut m&m’s (provided by instructor) Theory: Physical quantities are always specified relative to a particular standard or unit , and the unit should always be stated. For example, if an employer made you an offer to work for 125 per hour, would you accept the offer? Since your boss did not state the unit along with the amount, the offer sounds suspect. Surely you would not work for 125 cents per hour (not in today's market). The commonly accepted set of units use today is the Système International (SI). The SI system is based on the metric system. The metric system is convenient because it is based on a decimal system (i.e.: powers of ten). Therefore, it simplifies calculations by using a set of prefixes shown below. Prefix: Symbol: Magnitude: Meaning (multiply by): Yotta- Y 10 24 1 000 000 000 000 000 000 000 000 Zetta- Z 10 21 1 000 000 000 000 000 000 000 Exa- E 10 18 1 000 000 000 000 000 000 Peta- P 10 15 1 000 000 000 000 000 Tera- T 10 12 1 000 000 000 000 Giga- G 10 9 1 000 000 000 Mega- M 10 6 1 000 000 myria- my 10 4 10 000 kilo- k 10 3 1000 hecto- h 10 2 100 deka- da 10 10 deci- d 10 -1 0.1 centi- c 10 -2 0.01 milli- m 10 -3 0.001 micro- μ (mu) 10 -6 0.000 001 nano- n 10 -9 0.000 000 001 pico- p 10 -12 0.000 000 000 001 femto- f 10 -15 0.000 000 000 000 001 atto- a 10 -18 0.000 000 000 000 000 001 zepto- z 10 -21 0.000 000 000 000 000 000 001 yocto- y 10 -24 0.000 000 000 000 000 000 000 001 Rev. by Crivello 1-19-2010

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Metric System and Density 2 Using the metric system, it is easy to calculate how many millimeters are in 3 kilometers – it’s just a matter of moving the decimal place over. However, in the English system it is a lot of work to calculate the number
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physics 125 - Metric System and Density SAN DIEGO MESA...

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