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Class : PhysicsUnit : 1 : 1 - D MotionLesson : Vectors / Distance vs . displacement .Date : 1 - 30

SWBAT: Determine 1d distance and displacement and use vectors in this process .

Materials / Setup : Outline : Homework :

Yellow Hewitt Books P.P. books Vector Inquiry

Handout - Cut out cards !!

Working Stopwatches

Computer hookup

w / powerpoint . Homework worksheet .

Speed pblms on an overhead .

1. Catalyst (5min )2. Intro to motion (20

min )3. Vectors Inquiry (15

min )4. Vectors Debriefed

(5 )5. Speed (15 minutes )6. Speed practice (15

minutes )7. How fast Powerpoint

Speed problems homework .

Collect :Physics Unit conversions sheet.- Check and give feedback

CATALYST:(5 minutes )Get the Yellow Hewitt Books ! Take a ruler from the front and with a partner :

1. On a blank sheet of paper, turn it sideways (landscape) and put anx in the bottom left corner.

2. Measure 6 centimeters NORTH (put an x)3. Measure 4 centimeters EAST (put an x)4. Measure 6 centimeters NORTH (put an x)5. Measure 8 centimeters EAST (put an x)6. Measure 12 centimeters SOUTH (put an x)7. Measure 12 centimeters WEST (put an x)

INTRO TO MOTION :(20 minutes )On Board : MOTIONIn the coming weeks, we will learn how to describe all of the motion in the universe .Yes . All of it . We will have all of the tools to describe - in other words tell you everything about what an object is doing, by the end of the next two units . After we nish describing the motion of the universe, we will spend the rest of the semester

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explaining why that motion occurs . The why is mainly forces and motion with some other ideas thrown in there too .

We are going to start with a reading . 4 minutes !!!In the yellow Hewitt books I want you to read pgs 10 - 11, Linear Motion and Motion is Relative .

When you are done, you should take a few notes on what you just read .

-- Questions to get to this denition :Motion is always relative to another object .

In order to talk about motion, we muse rst dene a few ideas . Motion is the rate of change in position OR the change in position in an amount of time .

Distance :How far an object has traveled . (odometer in a car )

Displacement : The di f erence between the nal and initial positions .Displacement = Final position - initial position D=df - di OR for X axis DELTA X = Xf - Xi

Example : Draw -- Start at origin, go out 3 m, come back 3 m .Distance = 6 m .Displacement = 0 m .

Go back to the catalyst . Calculate the distance traveled and the displacement .Distance =48 cm . Displacement =0 cm .

Concept test :- walk 1 m forward - write down distance and displacement .restart - write down just my displacement - walk around in circles, go where I started .

Concept questions :If you run around a mile track 1 time, what is your distance? What is your

displacement?

If you were to pay for gas by the mile, but you got to choose whether you paid for your milage measured by distance or displacement, which would you choose?

If a coach told you to run a mile, and you did but he / she wasnt watching, what would you say in response to the coachs claim that you couldnt have run the mile because you were right where you started?

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VECTORS INQUIRY:(15 minutes ) Give out cards . Then once they have rules hand out the rules sheet .

VECTORS DEBRIEF:(5 minutes ) There are some quantities that we can express with just a number,

which we formally call a magnitude alone . We call these scalars . Other numbers need a magnitude and direction, which are vectors .Scalars : Magnitude (number, no sign ) aloneVectors : Magnitude and Direction .

Lets talk about Displacement and Distance in terms of vectors now .Distance is a scalar .Displacement is a vector .

Ex: 4N + 2 W +4S + 2 E

As Scalars :4 +2 +4 +2 = 12 = distance .As Vectors :4 N +4S = 02W + 2E = 0Displacement =0 .

EX: 3 W +2 N + 4 E +2s .Distance and Displacement? - They nd this quantity .

SPEED

:(15 minutes ) We have now introduced the idea of traveling some distance . We may want to know more if we are to explain all the motion in the Universe . For instance, we may want to know how quickly someone gets somewhere .

The concept we will introduce today is speed .To describe motion, we need both a distance and a time .

Speed is the rate that distance is traveled .OR Speed is the amount of distance traveled in some unit of time .

Then, speed is :Average Speed = total distance / total time(PUT LINE ON S) S= d / t

Aside : The Line above a variable means that this is an average .

Example :

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I am going to walk 2 meters at the front of the class, and we will calculate my average speed . We cant calculate my real speed, because it will vary . The fact that I am waling and not gliding - the imperfections of my motion, means that my speed will not remain absolutely the same . However, because we can nd the total distance I travel, and the total time, we can nd the average speed .

-- Carry out the experiment and put the result on the board .

From this we see, speed is a measure of however far we go divided by the amount of time it takes us . In fact, we can simplify our equation down to say that speed is the number of meters we go every second . So for my speed I go __( calculated )__ meters every second .

Just put numbers up .Units of speed are m / s .

s [ ] = d [m ] / t [s ][] = [ m ]/[ s ]s [m / s ]

Concept check : Speed is the rate at which what happens?

How far will a ball move in one second if its speed is 5 m / s?

SPEED:

(15 minutes ) Write these

on

an

overhead

:1 explicitly, 1 they walk me through, one they walk a classmate through at the board .

2 on their own .1 ) This weekend, Mr. Sirolly drove from Weldon to Littleton (20 km ). It took 0 .25 hours . What was his average speed?2 ) On Friday, I went to the football game and measured Allens average speed to be 6 .02 m / s . How far would he travel if he were to run at that rate for 137 s?3 ) A penguin jumps into the arctic and swims with a speed of 0 .98 m / s . If he swims for 34 min, how far does he go? 4 ) If you ride your bike straight for 15 min with an average speed of 12 .5 km / hr, how far have you ridden? 5 ) If you 're in the mall and you walk for 9 .5 min with an average speed of 1 .2 m / s, what is your displacement?

SPEED:(15 minutes ) How fast are things? Show powerpoint - write them down if you want .Final challenge - nd the average speed of a Northwest Student . Do it .