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Objective: We will review measurement with a lab investigation. Homework: Complete

9-18-12. 10 min. QUIZ Today!. Objective: We will review measurement with a lab investigation. Homework: Complete Measurements Lab!. 9-19-12. 10 min. QUIZ Today!. Objective: We will review measurement with a lab investigation. Homework: Complete “1. Stop and think: a. and b.” on

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Objective: We will review measurement with a lab investigation. Homework: Complete

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  1. 9-18-12 10 min. QUIZ Today! Objective:We will review measurement with a lab investigation. Homework: Complete Measurements Lab!

  2. 9-19-12 10 min. QUIZ Today! Objective:We will review measurement with a lab investigation. Homework: Complete “1. Stop and think: a. and b.” on Measurements Lab if not already finished.

  3. Chapter 1: Measurements • Measurement : • a determination of the amount of something. • What are the two parts to measurement? : • Value (a number) • Unit

  4. 1.1 – Two Common Systems • English System • Most familiar to us in U.S. • What units are common? • Miles, yards, feet, pounds, pints, quarts, gallons, cups, teaspoons • SI – International System of Units • Used by most countries and by the scientific community. • Metric system based on factors of 10. • Common Units? • Meters, liters, grams, celsius

  5. 1.1 - SI International Systems of Units

  6. 1.1 - SI International Systems of Units

  7. 1.1 – Accuracy Vs. Precision Would you say the person who shot this arrow was accurate or precise? Accuracy – how close a measurement is to the accepted value.

  8. 1.1 – Accuracy Vs. Precision Would you say these arrows are accurate or precise? Precision – how close together repeated measurements are to one another.

  9. 1.1 – Accuracy Vs. Precision~Comparing the two~ Precise but NOT accurate NOT precise and NOT accurate

  10. 1.1 – Accuracy Vs. Precision~Comparing the two~ Accurate AND precise Accurate

  11. 1.1 - Resolution • The smallest interval that can be measured. • The “sharpness” of a measurement.

  12. 9-20-12 ~ Write Your Name ~ Objective:We will briefly discuss conversions and finish our lab investigation of measurement. Homework: Complete “Measurements” lab and answer HW questions on pg. 5 of lab.

  13. 9-21-12 ~ Write Your Name ~ Objective:We will briefly discuss conversions and finish our lab investigation of measurement. Homework: Complete “Measurements” lab and answer HW questions on pg. 5 of lab.

  14. 1.3 – Converting Units • Have you ever had to convert something? Can you give an example? • Conversions help us to relate quantities. • Conversion Factor – a ratio that is used when setting up a unit conversion problem. It is often used when you want to convert SI units to English units. • Ex. - Convert 4.5 ft to cm (there are 30.48 cm in 1 foot)

  15. 1.3 – Converting Units • Use the Decimal Point Rule and conversion chains! KingHenryDiedByDrinkingChocolate Milk • Given:How many decimeters in 0.0025 kilometers?

  16. King Henry Died ByDrinking Chocolate Milk

  17. 1.4 – Measurement and Graphing Visual Representations of data that are used to show how variables are related. What are some ways that graphs are used in our daily lives or in the scientific community?

  18. 1.4 – Measurement and Graphing • Various Types of graphs: • Scatterplot graph ( XY graph)– used to visualize 2 variables thought to be related • Bar graph – compares data grouped by a name or category. • Pie graph – Shows the amount each part makes up to form the whole (100%) • Line graph –often shows how data changes over time.

  19. 1.4 – Measurement and Graphing

  20. 1.4 – Measurement and Graphing • Interpreting graphs: • With scatter plot graphs, you have 2 variables • Independent Variable – might influence another variable (ex. – water depth) • Dependent Variable – is influenced by the independent variable (ex. – water pressure)

  21. 1.4 – Measurement and Graphing • Interpreting graphs: • With scatterplot graphs and line graphs, you have direct and indirect relationships • Direct relationship – one variable increases with an increase in another variable. • Ex? – Depth vs. Pressure scatterplot graph • Indirect relationship – one variable decreases when another variable increases

  22. 1.4 – Measurement and Graphing • MIXES TUCS: • Trick to remember how to make a graph • M: Maximize your graph • IX: Independent variable on x-axis • ES: Equally spaced scale increments • T: Title (includes axis names) • U: Units and labels on both axes • CS: Continuous smooth curve connects data

  23. 1.4 – Measurement and Graphing How to read a graph:

  24. 1.2 – Measuring Time and Distance • When measuring time you can answer two types of questions. What are they? • 1) What time does the game begin? • 2) How long does the game last? (also known as a time interval)

  25. 1.2 – Measuring Time and Distance • Name some familiar units of measuring time: • Seconds • Hours • Minutes • Years • Centuries

  26. 1.2 – Measuring Time and Distance • Distance – the amount of space between two points. • The meter stick is a common tool used for measuring length • Do you know the distance you travel to school each day? • What units do we use to measure distance? • Meters, kilometers, light years (1 ly = 9.46 x 1012 km), parsec (equals about 3.26 ly), miles, feet

  27. 1.2 – Measuring Time and Distance

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