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

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