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Chapter 9, Section 1 Describing and Measuring MotionPowerPoint Presentation

Chapter 9, Section 1 Describing and Measuring Motion

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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

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 SpeedVelocity

- 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)

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