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# Chapter 9, Section 1 Describing and Measuring Motion PowerPoint PPT Presentation

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

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.

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

### Vocabulary Words

• Motion

• Reference point

• Meter

• Speed

• Velocity

• Slope

### 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

• 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

• The SI system is used to measure distance.

• Distance is measured in meter.

• Meter is a little longer than a yard.

### 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

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.

### 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

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

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

### 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

• 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

• 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

• Graphing worksheet (2/12)

• Workbook 9.1 (2/12)

• Vocabulary quiz 9.1 (2/12)