an interaction of one or more of our (5) senses--sight, smell, hear, touch, or taste, within our...

What is an observation??

an interaction of one or more of our (5) senses--sight, smell, hear, touch, or taste, within our surroundings or environment.

Flash back….Last year question!!!!

We use our

To make observations

Look at those!!!!

What is an inference?the interpretation of one or

more observations.• reaching conclusions• proposing explanations


What is a prediction?an inference based on observations. Ex: Weather forecasts are predictions based on past and present conditions

We use measurements to make better observations

Measurement: is a means of describing observations using numbers.

We use tools/instruments to make better observations

Quiz Time….What is this instrument called, what does it measure, and what are the basic units???


What is time?

(second, minute, hour, day, year...) is the moment at which something happens or the duration during which a change occurs.

We'll learn about more instruments this year!

Even though we use instruments to make better measurements, measurements are subject to error!

How close are our measurements to the "real" value?

Percent Error =

Measured Value - Accepted Value

Accepted Value

× 100%

For all calculations, you MUST show all three steps to receive credit!!!

1)Write the formula2)Substitute values into the

equation3)Show correct answer with units

Practice a percent error/deviation problem…

Megan measured a line to be 32 cm. long. The accepted value is 30 cm. What was Megan’s % deviation?

Quick Review: Scientific Notation

•If the number is less than 1, the exponent is negative

•If the number is greater than 1, the exponent is positive

•You count places to move the decimal point so that there is one number to the left of the decimal point.

•The number of places you moved the decimal point equals the exponent

Examples:345,000,000 3.45 × 109

0.0009348 9.348 × 10-

4

Scientific Notation Examples

99.343

4000.1

0.000375

0.0234

94577.1

9.9343 x 101

4.0001 x 103

3.75 x 10-4

2.34 x 10-2

9.45771 x 104

Place the following numbers in scientific notation:

Going to Ordinary Notation Examples

3 x 106

6.26x 109

5 x 10-4

8.45 x 10-7

2.25 x 103

300000062600000000.00050.0000008452250

Place the following numbers in ordinary notation:

an interaction of one or more of our (5) senses--sight, smell, hear, touch, or taste, within our...

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