Post on 20-Jan-2016
Objective:Objective: We will review measurementwith a lab investigation.
Homework:Homework: • Complete
Measurements Lab!
Objective:Objective: We will review measurementwith a lab investigation.
Homework:Homework: • Complete “1. Stop and
think: a. and b.” onMeasurements Lab ifnot already finished.
• Measurement : – a determination of
the amount of something.
What are the two parts to measurement? : Value (a number) Unit
• 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
• Would you say the person who shot this arrow was accurate or precise?
• AccuracyAccuracy – how close a measurement is to the accepted value.
• Would you say these arrows are accurate or precise?
• PrecisionPrecision – how close together repeated measurements are to one another.
• The smallest interval that can be measured.– The “sharpness” of a measurement.
~ ~ Write Your NameWrite Your Name ~ ~Objective:Objective: We will briefly discuss conversions and finish our lab investigation of measurement.
Homework:Homework: • Complete “Measurements”
lab and answer HW questions on pg. 5 of lab.
~ ~ Write Your NameWrite Your Name ~ ~Objective:Objective: We will briefly discuss conversions and finish our lab investigation of measurement.
Homework:Homework: • Complete “Measurements”
lab and answer HW questions on pg. 5 of lab.
• 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 cmEx. - Convert 4.5 ft to cm
(there are 30.48 cm in 1 foot)(there are 30.48 cm in 1 foot)
• Use the Decimal Point Rule and conversion chains!
King Henry Died By Drinking Chocolate Milk
• Given: How many decimeters in 0.0025 kilometers?
King Henry Died By Drinking Chocolate Milk
• 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?
• 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.
• 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)
• 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
• 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
• How to read a graph:
• 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)
• Name some familiar units of measuring time:
– Seconds– Hours– Minutes– Years– Centuries
• 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