1. To the teacher:
This CPO Science PowerPoint presentation is designed to guide you through the process of presenting the lesson to your students. The presentation uses a 5-E teaching model: Engage, Explore, Explain, Elaborate, and Evaluate.
The PowerPoint Slide notes indicate where you may want to bring in various lesson elements such as quizzes, readings, investigations, animations, and practice materials. Additional science background information is provided in the slide notes where appropriate. You can view these notes by selecting “View,” then “Normal.” You will see the notes pane at the bottom of the PowerPoint workspace. Additionally, the slide notes are available as a separate document, accessible from the lesson home page.
The slides that follow are intended for classroom use.
About the slide notes:
The slide notes for this presentation are available in a separate document that you can print and look at while you use the slides. You can access the slide notes document from your teacher lesson home page.
Enjoy the lesson!

2. Describing motion
It’s a fact: You are always in motion, even when you are fast asleep.
How can this be? Can you give any examples to support this statement?
ENGAGE: Encourage students to brainstorm answers to this question. Example answers include: Internally, your heart and lungs continue to move. With respect to the universe, the 24-hour rotation of Earth carries us around at several hundred miles per hour. And Earth is revolving around the Sun, rushing through space at the astounding speed of 67,000 miles per hour! To understand the physical universe, we need to understand speed, velocity, and acceleration.

3. What is speed? Speed is distance traveled divided by time taken.
What is the girl’s average speed if she crosses the finish line in 15 seconds?
EXPLAIN: Review the concept of speed with your students. The girl’s average speed is 6.7 m/s.

4. What is velocity?
The velocity of an object tells you both its speed and its direction of motion.
The velocity of an object changes when its direction changes as well as when its speed changes.
Velocity can be positive or negative. If the velocity is negative, the object is moving toward the origin.
Which car in the graphic has a negative velocity?
EXPLAIN: Review the concept of velocity. The blue (west-bound) car is traveling toward the origin, so it has a negative velocity.

5. What is acceleration?
Acceleration is the change in velocity over time.
Acceleration changes when the object’s speed changes and/or when the object’s direction changes.
An object traveling at a constant speed in one direction has an acceleration of zero.
Acceleration is negative if the object is slowing down.
EXPLAIN: Review the concept of acceleration. Show the acceleration animation which you can access from the multimedia lesson home page. Then ask students to try the sample problem on the next slide.

6. Try this:
A rabbit starts from a resting position and moves at 6 m/s after 3 seconds. What is the acceleration of the rabbit?
Explain: The rabbit’s acceleration is 2 m/s/s or 2 m/s2. Assign the student reading.

7. Time to investigate! Complete the lesson investigation:
- Acceleration: How is the speed of the car changing?
EXPLORE:
Lead the lesson investigation: Acceleration.

8. Time for Practice! Complete the lesson practice activity.
Look over the examples and then try this first problem with a partner.
ELABORATE:
Guide students as they complete the practice activity: Velocity and Acceleration.

9. Show what you know!
Try the lesson’s interactive quiz, or complete a quiz that your teacher can print out for you.
Hint:
You might want to review your lesson reading piece one more time before trying the quiz.
EVALUATE:
Print out the 10-question quiz for students to complete, or have students work individually at computers to complete the interactive quiz they can access from the multimedia lesson home page.