1. Significant figures We can only be as precise as our least precise measurement m – 2 significant figures m – 1 significant figures.

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Presentation transcript:

Bellwork: What do you think the difference between accuracy and precision?

1. Significant figures We can only be as precise as our least precise measurement. 0.00034 m – 2 significant figures 0.001 m – 1 significant figures

2. Scientific Notation We are lazy… we don’t want to write a ton of zeroes. A way of expressing a value as a number between 1-10 and a power of ten. Example: speed of light 300,000,000 m/s Scientific notation = 3.0 x 108 m/s The exponent indicates how many places the decimal moved.

2. Scientific Notation Exponent is positive: greater than 1 Exponent is negative: less than 1 (decimal) Example: 0.00086 8.6 x 10-4

2. Scientific Notation 4.2 x 104 3.9 x 10-6 450,000 42000 0.0000039 4.5 x 105

3. Temperature conversions or 5F˚ = 9C˚ + 160 SI Unit: Kelvin K = C˚ + 273 C˚ = K – 273 MUST be in Celsius to get to Kelvin 0K = absolute zero

5. Metric Conversion King Henry Died by Drinking Chocolate Milk kilo hecta deka BASE deci centi milli meter, liter, gram 1000 100 10 1 0.1 0.01 0.001

6. Factor Label Method 1) Write given number over 1. 39 cm 1

39 cm m 1 cm 6. Factor Label Method 2) Multiply the given by a fraction set up with the unit you were given on the bottom, and the unit you need to convert to on the top. 39 cm m 1 cm

1 39 cm m 100 cm 1 6. Factor Label Method 3) The larger unit gets a 1. The other unit gets the conversion factor. 1 39 cm m 100 cm 1

1 39 cm m 0.39 100 cm 1 6. Factor Label Method 4) Multiply the numbers on top, divide by the numbers on the bottom. 1 39 cm m 0.39 100 cm 1

1 39 cm m 0.39 100 cm 1 6. Factor Label Method 5) Cancel out units that appear on the top and bottom. 1 39 cm m 0.39 100 cm 1

1 39 cm m m 0.39 100 cm 1 6. Factor Label Method 6) Rewrite with the final units. 1 39 cm m m 0.39 100 cm 1

Metric Conversions 1 g 2 1000 mg A dose of placebo is 2000 mg of sugar. How many grams is this? 2000 mg x ________ = ________g 1 g 2 1000 mg

Metric Conversions 1000 m 1 km You run a 104 km race. (WHOA) How many meters is this? 104 km x ________ = ________g 1000 m 104,000 1 km

Work on rest of classwork packet Homework sheet DUE TOMORROW Measurement lab due tomorrow too!!!