CK-12 Physical Science - For Middle School

12.2. Speed and Velocity http://www.ck12.org You Try It! Problem:If Maria runs at a speed of 2 m/s, how far will she run in 60 s ...

http://www.ck12.org Chapter 12. Motion Lesson Review Questions Recall What is speed? How is it calculated? Define velocity. Ap ...

12.3. Acceleration http://www.ck12.org 12.3 Acceleration Lesson Objectives Define acceleration. Explain how to calculate accele ...

http://www.ck12.org Chapter 12. Motion FIGURE 12.11 How is velocity changing in each of these pictures? If you are accelerating, ...

12.3. Acceleration http://www.ck12.org Calculating Acceleration Calculating acceleration is complicated if both speed and direct ...

http://www.ck12.org Chapter 12. Motion velocity instead of distance. The graph inFigure12.13 represents the velocity of a sprint ...

12.3. Acceleration http://www.ck12.org Apply Concepts The velocity of a car on a straight road changes from 0 m/s to 6 m/s in 3 ...

http://www.ck12.org Chapter 12. Motion 12.4 References Train: John H. Gray; Cyclist: Flickr:DieselDemon; Inchworm: Clinton Char ...

http://www.ck12.org CHAPTER 13 Forces Chapter Outline 13.1 What Is Force? 13.2 FRICTION 13.3 GRAVITY 13.4 ELASTICFORCE 13.5 REFE ...

http://www.ck12.org Chapter 13. Forces 13.1 What Is Force? Lesson Objectives Define force, and give examples of forces. Describ ...

13.1. What Is Force? http://www.ck12.org Force as a Vector Force is a vector because it has both size and direction. For example ...

http://www.ck12.org Chapter 13. Forces FIGURE 13.3 A book resting on a table is acted on by two opposing forces. If the opposing ...

13.1. What Is Force? http://www.ck12.org individual forces alone. In this case, the net force on the couch is 45 newtons to the ...

http://www.ck12.org Chapter 13. Forces Lesson Review Questions Recall Define force. Give an example of a force. What is a newto ...

13.2. Friction http://www.ck12.org 13.2 Friction Lesson Objectives Describe friction and how it opposes motion. Identify types ...

http://www.ck12.org Chapter 13. Forces too much friction between moving parts in a car engine can cause the parts to wear out. O ...

13.2. Friction http://www.ck12.org FIGURE 13.8 The surface of metal looks very smooth unless you look at it under a high-powered ...

http://www.ck12.org Chapter 13. Forces FIGURE 13.10 When you rub the surface of a match head across the rough striking surface o ...

13.2. Friction http://www.ck12.org Static Friction Static friction acts on objects when they are resting on a surface. For examp ...

http://www.ck12.org Chapter 13. Forces FIGURE 13.13 The ball bearings in this wheel reduce fric- tion between the inner and oute ...