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Regents Physics 9/12/2012

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**OBJECTIVE: SWBAT convert between units with different prefixes.**

Do Now: A yard is a little less than a meter long (1 yard = 0.91m). Estimate the height of your table in yards and then convert that quantity in terms of m or km. One inch is about 2.5cm long. Estimate the length of your pencil in centimeters. Given there are 100cm in 1m. How many meters are there in 80 cm?

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Agenda Becoming familiar with metric units: What does a m, L, g look like? Convert between units with different prefixes

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**English to Metric System**

What is something that is about: 1m long?

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Basic Units Distance: meters (m) Mass: grams (g) Volume: liters (L)

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Mnemonic King -- Kilo Henry -- Hexa Died -- Deca Unexpectedly – Base unit Drinking -- deci Chocolate -- centi Milk – milli (micro)

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SI Prefixes You move the decimal place when you are converting between units with different prefixes km 1000 Hm 100 decm 10 m 1 dm 0.1 cm 0.01 mm 0.001s

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**Example Convert 70mm into meters.**

Identify the quantity measured. What is the base unit? Is a millimeter smaller or bigger than a meter? How much smaller/bigger is a mm compared to a m? km 1000 hm 100 decm 10 m 1 dm 0.1 cm 0.01 mm 0.001s

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**How to convert between units?**

1000mm in 1 meter Conversion factor is 1000: 1000mm/m or 1m/1000mm Would I divide or multiply the number by its conversion factor? Moving LEFT (to larger units) DIVIDE by the conversion factor. Moving RIGHT (to smaller units) MULTIPLY by the conversion factor. km 1000 hm 100 decm 10 m 1 dm 0.1 cm 0.01 mm 0.001

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km 1000 hm 100 decm 10 m 1 dm 0.1 cm 0.01 mm 0.001 mm are smaller than m, so 70mm will be a fraction of a meter! 1000mm in 1 m! 70mm ÷(1000mm/m) = 0.07m

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**Group work Convert 22L into mL. Is a L smaller or bigger than a mL?**

How much smaller/bigger is a L compared to a mL? What is the conversion factor? kL 1000 hL 100 decL 10 L 1 dL 0.1 cL 0.01 mL 0.001

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**Worksheet: Metrics and Prefixes**

Directions: For each group of values listed below, write the items in order from largest to smallest. Then state whether the values represent distance, mass, or volume.

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**Exit Slip Questions: Convert 54kg to grams (g).**

Directions: Close your binder/notebook and clear your table. Answer the questions on a sheet of paper. This activity is to be completed independently. Questions: Convert 54kg to grams (g). Convert 458cm to meters (m).

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