Chapter 9, Section 1 Describing and Measuring Motion Thursday, February 11, 2010 Pages 282 -- 293...
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Transcript of Chapter 9, Section 1 Describing and Measuring Motion 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
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.
Vocabulary WordsVocabulary Words
MotionReference pointMeterSpeedVelocitySlope
MotionReference pointMeterSpeedVelocitySlope
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.
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.
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.
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
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.
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.
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)
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.
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.
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
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)