Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293...

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Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293

Transcript of Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293...

Page 1: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Chapter 9, Section 1 Describing and Measuring

Motion

Chapter 9, Section 1 Describing and Measuring

MotionThursday, February 11,

2010Pages 282 -- 293

Thursday, February 11, 2010

Pages 282 -- 293

Page 2: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

ObjectivesObjectives

Explain when an object is in motion and how motion is relative to a reference point.

Calculate an object’s speed and velocity using SI units of distance.

Graph motion showing changes in distance as a function of time.

Explain when an object is in motion and how motion is relative to a reference point.

Calculate an object’s speed and velocity using SI units of distance.

Graph motion showing changes in distance as a function of time.

Page 3: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Vocabulary WordsVocabulary Words

MotionReference pointMeterSpeedVelocitySlope

MotionReference pointMeterSpeedVelocitySlope

Page 4: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

How Do We Know Something Has Moved?

How Do We Know Something Has Moved?

An object is in motion when its distance from another object is changing.

An object is moving or not depends on your point of view.

An object is in motion when its distance from another object is changing.

An object is moving or not depends on your point of view.

Page 5: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Reference PointReference Point

A place or object used for comparison to determine if something is in motion.

An object is in motion if it changes position relative to a reference point.

A place or object used for comparison to determine if something is in motion.

An object is in motion if it changes position relative to a reference point.

Page 6: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Describing DistanceDescribing Distance

The SI system is used to measure distance.

Distance is measured in meter.

Meter is a little longer than a yard.

The SI system is used to measure distance.

Distance is measured in meter.

Meter is a little longer than a yard.

Page 7: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Calculating SpeedCalculating Speed

If you know the distance an object travels in a certain amount of time, you know the speed of the object.

Speed=Distance/Time

If you know the distance an object travels in a certain amount of time, you know the speed of the object.

Speed=Distance/Time

Page 8: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Constant Speed vs. Average Speed

Constant Speed vs. Average Speed

Constant SpeedIf the speed of an object does not change.

The speed is the same at all times during its motion.Example: Merry-go-round.

Constant SpeedIf the speed of an object does not change.

The speed is the same at all times during its motion.Example: Merry-go-round.

Average SpeedObjects do not ove at constant speeds for a long period of time.

The total distance is divided by the total time to find the average speed.

Average SpeedObjects do not ove at constant speeds for a long period of time.

The total distance is divided by the total time to find the average speed.

Page 9: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

VelocityVelocity

Speed in a given direction is called velocity.

Velocity can be calculated if you know both the speed and the direction of an object’s motion.

Speed in a given direction is called velocity.

Velocity can be calculated if you know both the speed and the direction of an object’s motion.

Page 10: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Graphing MotionGraphing Motion

Time is shown on the x-axis (horizontal).

Distance is shown on the y-axis (vertical)

Time is shown on the x-axis (horizontal).

Distance is shown on the y-axis (vertical)

Page 11: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

SlopeSlope

The steepness, or slant of a line on a graph is called its slope.

It tells you how fast one variable changes in relation to the other variable (rate of change).

The steeper the slope, the faster the motion.

The steepness, or slant of a line on a graph is called its slope.

It tells you how fast one variable changes in relation to the other variable (rate of change).

The steeper the slope, the faster the motion.

Page 12: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Calculating SlopeCalculating Slope

Slope = Rise/RunThe RISE is the vertical difference between the two points.

The RUN is the horizontal difference between the two points.

Slope = Rise/RunThe RISE is the vertical difference between the two points.

The RUN is the horizontal difference between the two points.

Page 13: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.
Page 14: Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293 Thursday, February 11, 2010 Pages 282 -- 293.

Practice GraphingPractice Graphing

Begin the Practice Worksheet in class and finish for homework. Due next meeting (2/12).

You can also practice online:http://www.mathwarehouse.com/algebra/linear_equation/slope-of-a-line.php

http://www.algebrahelp.com/worksheets/view/graphing/slope.quiz

Begin the Practice Worksheet in class and finish for homework. Due next meeting (2/12).

You can also practice online:http://www.mathwarehouse.com/algebra/linear_equation/slope-of-a-line.php

http://www.algebrahelp.com/worksheets/view/graphing/slope.quiz

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HomeworkHomework

Graphing worksheet (2/12)Workbook 9.1 (2/12)Vocabulary quiz 9.1 (2/12)

Graphing worksheet (2/12)Workbook 9.1 (2/12)Vocabulary quiz 9.1 (2/12)