New Seats!  Find the popsicle stick with your name on it and sit in that seat  Begin copying the objectives of the day.

Distance and Time 1.2 pp Mr. Richter

Agenda  New Seats!  Collect Posters (Rubrics attached!)  Video Consent Forms  Warm-Up  Finish Yesterday’s Notes (if applicable)  Any questions about the quiz?  Introduction to the Metric System  Notes  Systems of Units (The Metric System)  Metric Prefixes and Unit Conversion  Distance and Length  Time  Distance and Time Graphs

Objectives: We Will Be Able To…  Know the meaning of metric prefixes  Express distances using the appropriate metric units.  Convert between different metric prefixes using decimals.  Interpret distance and time graphs.

Warm-Up:  There are 5280 feet in a mile. There are 1000 meters in a kilometer.  How many feet are in 4 miles?  How many meters are in 4 kilometers?

For Tomorrow’s Quiz You Should:  Review your notes  Review the slides online  Pay special attention to things I have repeated  (Like vocab, objectives, homework problems…)  Bring a sharpened pencil and be ready to go at the bell tomorrow

The Metric System

 There are two common standardized systems of measurement.  The English (British) system uses inches, feet, yards and miles.  The International System (SI) or metric system uses centimeters, meters and kilometers.  The vast majority of countries and scientists use the metric system.  Why? It’s easier!

The Metric System  The metric system is based on powers of 10.  Metric prefixes are used to indicate how large or how small a unit is.  Or… how many powers of 10 larger or smaller than the unit is the measurement.  For example: 23 kilometers is 1000 times larger than 23 meters.  The prefix “kilo-” stands for  You will be asked to memorize the list of prefixes to the right.

The Metric System and Scientific Notation  Scientists also use scientific notation, along with metric prefixes, to indicate very large or very small numbers.  It looks like:  meters = 2.3 x 10 4 meters, oooor…  meters = 4.6 x meters  This is an introduction. We will see this later on in the year. Don’t freak out yet.

Metric Prefix Practice  Work by yourself in your notes to answer each question.  Remember to think in terms of being realistic: are meters larger or smaller than the original unit?  How many meters is: 1.42 kilometers kilometers kilometers centimeters centimeters 6.42 centimeters centimeters

Warm-Up  Work by yourself in your notes to answer each question.  Remember to think in terms of being realistic: are meters larger or smaller than the original unit?  If you can, try to do this from memory; without the prefix charts.  How many meters is: 1.42 kilometers kilometers kilometers centimeters centimeters 6.42 centimeters centimeters

Warm-Up  Convert 589 cm to:  meters  kilometers  millimeters  (If this is a struggle for you, you must seek extra help ASAP)

Agenda  Warm-Up  Review Quiz  Set Up Portfolios  Review HW  Distance and Length  Distance and Time Graphs

Objectives: We Will Be Able To…  Know the meaning of metric prefixes  Express distances using the appropriate metric units.  Convert between different metric prefixes using decimals.  Interpret distance and time graphs.

Distance and Length

 What is measurement?  A measurement tells you how much of something.  A measurement requires a quantity and a unit.  For example:  If you are asked how far you live from school, you don’t answer “four”. That makes no sense. You probably mean “four miles”. Quantity and unit.

Distance and Length  Distance is: the amount of space between two points.  Sometimes we refer to distance as position, or the distance away from zero, the origin.  Distance is measured in (SI) units of length.  micrometers  millimeters  centimeters  meters (base unit)  kilometers  etc.

Distance and Length  The graphic below gives an idea as to which units are appropriate for what size distance.

Time  For many experiments, time is either an important factor or the independent variable.  There are two ways to think about time in physics.  Absolute time: when precisely did something occur?  September 14, 2011 at 10:14 am  Relative time: how long did something take to happen?  42.3 seconds  This is called a time interval.  Most experiments are measured in time intervals, and data is collected from t = 0.

Distance and Time Graphs  This graph has three distinct sections of time.  Sketch the graph in your notes, then…  In complete sentences, describe what you think is happening in each section.

Distance and Time Graphs  In your groups, sketch the graph (no numbers, just labels) of the position vs. time of an elevator that:  Starts in the lobby (ground floor)  Goes up to the third floor  Up further to the seventh floor  And ends up on the second floor.  If you need help or have questions, ask!

Wrap-Up: Did we meet our objectives?  Metric prefixes are used to express how much larger or smaller a quantity is relative to the unit value.  Distances are measured using the metric units of length: centimeters, meters, kilometers etc.  The metric system is used because it is easy to convert between units of different sizes.  Distance and time graphs show the relative position of an object as time passes.

Homework  pp Reviewing Concepts #14, 15, 20  p 25 #3-5  p 26 Solving Problems #7