Chapter 9 section 1 describing and measuring motion
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Chapter 9, Section 1 Describing and Measuring Motion. Thursday, February 11, 2010 Pages 282 -- 293. Objectives. 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.

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Chapter 9, Section 1 Describing and Measuring Motion

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Chapter 9 section 1 describing and measuring motion

Chapter 9, Section 1 Describing and Measuring Motion

Thursday, February 11, 2010

Pages 282 -- 293


Objectives

Objectives

  • 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 words

Vocabulary Words

  • Motion

  • Reference point

  • Meter

  • Speed

  • Velocity

  • Slope


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.


Reference point

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 distance

Describing Distance

  • The SI system is used to measure distance.

  • Distance is measured in meter.

  • Meter is a little longer than a yard.


Calculating speed

Calculating 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


Constant speed vs average speed

Constant Speed

If the speed of an object does not change.

The speed is the same at all times during its motion.

Example: Merry-go-round.

Average Speed

Objects 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.

Constant Speed vs. Average Speed


Velocity

Velocity

  • 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 motion

Graphing Motion

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

  • Distance is shown on the y-axis (vertical)


Slope

Slope

  • 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 slope

Calculating Slope

  • Slope = Rise/Run

  • The RISE is the vertical difference between the two points.

  • The RUN is the horizontal difference between the two points.


Practice graphing

Practice 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


Homework

Homework

  • Graphing worksheet (2/12)

  • Workbook 9.1 (2/12)

  • Vocabulary quiz 9.1 (2/12)


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