Motion in One DimensionMotion in One DimensionCh 2Ch 2

Read and DefineRead and Define Take Home Lab #1Take Home Lab #1

Read Chapter 2Read Chapter 2

Complete the 6 vocabulary on page 67Complete the 6 vocabulary on page 67

One Dimensional MotionOne Dimensional Motion Simplest form of motionSimplest form of motion

Motion takes place over time and depends upon Motion takes place over time and depends upon a frame of referencea frame of reference

Frame of ReferenceFrame of Reference - a system for specifying - a system for specifying the precise location of objects in space and timethe precise location of objects in space and time

(See Visual CD for more information)(See Visual CD for more information)

DisplacementDisplacement

See Visual CD for informationSee Visual CD for information

Displacement- (Delta x or Displacement- (Delta x or x) the change in x) the change in position of an objectposition of an object

Delta- Delta- - change in a quantity - change in a quantity (final – initial)(final – initial)

x = xx = xff - x - xi i If along the x axisIf along the x axis

y = yy = yff - y - yi i If along the y axisIf along the y axis

DisplacementDisplacement Turn to page 41 and look at figure 2Turn to page 41 and look at figure 2

What is the Gecko’s displacement?What is the Gecko’s displacement? 85cm - 22 cm = + 63 cm85cm - 22 cm = + 63 cm

DisplacementDisplacement

From where you startFrom where you start

to where you end to where you end

it does not matter where you’ve it does not matter where you’ve been.been.

DisplacementDisplacement

Displacement is not always equal to the Displacement is not always equal to the distance traveleddistance traveled

Displacement can be positive or negativeDisplacement can be positive or negative

Answer the Conceptual Challenge #1 and Answer the Conceptual Challenge #1 and 2 on page 412 on page 41

Scalar VS VectorsScalar VS Vectors

ScalarScalar – – quantities with just magnitudequantities with just magnitudeEx: 55mphEx: 55mph

VectorVector- - quantities with magnitude and quantities with magnitude and directiondirection

Ex: 55mph , EastEx: 55mph , East

ScalarScalar VectorVector DistanceDistance displacement displacement

SpeedSpeed velocityvelocity

accelerationacceleration

Time may be considered its own categoryTime may be considered its own category The Physics 500 ActivityThe Physics 500 Activity

VariableVariable and and UnitsUnits DistanceDistance d d mm SpeedSpeed vv m/sm/s

TimeTime t t ss DisplacementDisplacement x x mm VelocityVelocity vv m/sm/s

variable- letter used in equationvariable- letter used in equation unit - measurementunit - measurement

Average SpeedAverage Speed average speed = average speed = distance traveleddistance traveled

time of traveltime of travelV = V = dd ttWhat is John’s average speed if he drove 10.0 What is John’s average speed if he drove 10.0

km, East and then drove 10.0 km, West in 15 km, East and then drove 10.0 km, West in 15 minutes.minutes.

20.0 km / 15 min = 1.3 km / min20.0 km / 15 min = 1.3 km / min

Average VelocityAverage Velocity

VVavgavg = = x x

tt

Graphing Student Motion Activity Graphing Student Motion Activity

Average VelocityAverage Velocity Average velocity = Average velocity = displacementdisplacement change in timechange in timeVVavgavg = = x x = = xxff - x - xii

t tt tff - t - tii

What is John’s average velocity if he drove 10.0 What is John’s average velocity if he drove 10.0 km, East and then drove 10.0 km, West in 15 km, East and then drove 10.0 km, West in 15 minutes.minutes.

0 km / 15 min = 0 km / min0 km / 15 min = 0 km / min

Average Speed and Average Average Speed and Average VelocityVelocity

Picture Practice problemsPicture Practice problems

Practice ProblemsPractice Problems

Pg 44 1-6Pg 44 1-6

Pg 47 #3Pg 47 #3

SlopeSlope Slope = Slope = rise rise

runrun

slope = slope = riserise = = x x = average velocity = average velocity run run t t

Instantaneous Velocity-Instantaneous Velocity- the velocity of an the velocity of an object at some instantobject at some instant

SlopeSlope

Pg 46 Figure 6Pg 46 Figure 6

Pg 47 #6Pg 47 #6