We will have our first test in 3. 3 WHAT!! Without units it is a meaningless statement! All measurements require a unit – otherwise the measurement is.

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Presentation transcript:

We will have our first test in 3. 3 WHAT!! Without units it is a meaningless statement! All measurements require a unit – otherwise the measurement is wrong!

Fundamental & Derived Units

Dimensions & Units Dimensions tell what physical property you are measuring like time, space, volume. Units say something about the amount you are measuring. Small distance mm, large distance km.

7 Base/Fundamental Units Physics UnitSymbol DimensionDefinition Meterm length Kilogramkg mass__________. Second___time__________. Ampere___charge rate elc charge flow. KelvinK________________.

Derived Units: Combos of base Mechanics – motion, force, matter. All units derived from kg, m, s. Ex: density, velocity.

Remind yourselves of the metric prefixes. Ref Tables g = ___ g. ____m = 1 pm 9  m=____m g = 1 Tg (Tera). 1x m = 1 pm (pico) 9  m= 9 x m (micro).

Practice. 13 Ghz 22 Mp 1.3 dm 15 mJ 13 x 10 9 hz 22 x 10 6 p 1.3 x m 15 x J

Text pg 27 #5

Dimensional Analysis Used to convert between units and prefixes. The method makes use of multiplying by unit factors to complete conversions.

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Video Lesson Metric Prefixes & Conversions xQN4 xQN4 Hwk. Text pg 28 #11 a-g. Show all work.

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Order of Magnitude & Estimation Physics must give values for the very large & the very small. The prefixes give orders of magnitude (power of 10) to the value.

Order of Magnitude All numbers can be expressed as a power of 10. O.M. refers to the power of 10 to which a measurement is closest. The number 2 is between 10 0 = 1 and 10 1 = 10 but closer to 1. OM = cm = 0.03 m between – m Closer to

2 km in meters = 2 x 10 3 m or 2000 m. order of magnitude in meters is  g = 1.4 x g. OM grams is ___________ We say “on the order of grams.

Some orders of magnitude are easy. In meters: 100 m = 1x 10 2 m. 2 mm = 2x m. 30 cm = 30 x m = 3.0 x m If the coefficient is between 4 – 6 it’s harder. Your calculator will do it right!

127 m 488 g 420 nm in m We can use the log function on your calculator to find the order of magnitude. Then round the answer ~ ~ x ~ ~ Using the log function, find the order of magnitude for the following:

2. What is the order of magnitude of the distance in meters from Earth to the moon? 10 9 m.

3. Estimate the order of magnitude of the height of the counter in cm. 100 cm ~ 10 2 cm. 4. Estimate the order of magnitude of the thickness of a pencil tip in meters. 1 mm = m

Hwk: Worksheet Order Magnitude Estimation

Fermi Estimations 4 min X8Is X8Is