CK-12 Physical Science Concepts - For Middle School

4.10. Force http://www.ck12.org Relate force and motion. What forces control the motion of everyday objects? Identify and defin ...

http://www.ck12.org Chapter 4. Motion and Forces 4.11 Combining Forces Define net force. Calculate the net force acting on an o ...

4.11 Combining Forces FIGURE 4.14 Look at the dogs playing tug-of-war in theFigure4.15. The dogs are pulling the rope in opposit ...

http://www.ck12.org Chapter 4. Motion and Forces FIGURE 4.16 FIGURE 4.17 Summary The net force acting on an object is the combi ...

4.11. Combining Forces http://www.ck12.org Explore More Practice calculating net force and determining the direction of motion b ...

http://www.ck12.org Chapter 4. Motion and Forces 4.12 Friction Define friction. Explain why friction occurs. Identify factors t ...

4.12. Friction http://www.ck12.org FIGURE 4.19 These photos show two ways that friction is useful FIGURE 4.20 These photos show ...

http://www.ck12.org Chapter 4. Motion and Forces FIGURE 4.21 FIGURE 4.22 A: Heavier objects press together with greater force, a ...

4.12. Friction http://www.ck12.org FIGURE 4.23 Summary Friction is a force that opposes motion between any surfaces that are to ...

http://www.ck12.org Chapter 4. Motion and Forces 4.13 Types of Friction Identify four types of friction. Compare and contrast s ...

4.13. Types of Friction http://www.ck12.org Static Friction Static friction acts on objects when they are resting on a surface. ...

http://www.ck12.org Chapter 4. Motion and Forces FIGURE 4.25 The ball bearings in this wheel reduce friction between the inner a ...

4.13. Types of Friction http://www.ck12.org http://www.fearofphysics.com/Friction/friction.html When do rolling and sliding fri ...

http://www.ck12.org Chapter 4. Motion and Forces 4.14 Gravity Define gravity. Describe Earth’s gravity. Relate gravity and weig ...

4.14. Gravity http://www.ck12.org Gravity and Weight Weight measures the force of gravity pulling downward on an object. The SI ...

http://www.ck12.org Chapter 4. Motion and Forces Why is there a tidal bulge of water on the opposite side of Earth from the moo ...

4.15 Newton’s Law of Gravity 4.15 Newton’s Law of Gravity Describe Newton’s law of universal gravitation, and explain why it wa ...

http://www.ck12.org Chapter 4. Motion and Forces Factors That Influence the Strength of Gravity Newton’s law also states that th ...

4.15. Newton’s Law of Gravity http://www.ck12.org MEDIA Click image to the left for use the URL below. URL: http://www.ck12.org/ ...

http://www.ck12.org Chapter 4. Motion and Forces 4.16 Einstein’s Concept of Gravity Identify limitations of Newton’s law of gra ...