CK-12 Physical Science - For Middle School

13.2. Friction http://www.ck12.org FIGURE 13.14 Fluid friction of the parachute with the air slows this skydiver as he falls. Th ...

http://www.ck12.org Chapter 13. Forces 13.3 Gravity Lesson Objectives Define gravity. State Newton’s law of universal gravitati ...

13.3. Gravity http://www.ck12.org Defining Gravity Gravityhas traditionally been defined as a force of attraction between two ma ...

http://www.ck12.org Chapter 13. Forces FIGURE 13.17 Sir Isaac Newton discovered that gravity is universal. Newton’s Law of Unive ...

13.3. Gravity http://www.ck12.org FIGURE 13.18 The moon keeps moving around Earth rather than the sun because it is much closer ...

http://www.ck12.org Chapter 13. Forces FIGURE 13.19 Einstein thought that gravity is the effect of curves in space and time arou ...

13.3. Gravity http://www.ck12.org greater mass means that it is pulled by a stronger force of gravity. However, a more massive o ...

http://www.ck12.org Chapter 13. Forces FIGURE 13.22 Aiming at the center of a target is likely to result in a hit below the bull ...

13.3. Gravity http://www.ck12.org Lesson Summary Gravity is traditionally defined as a force of attraction between two masses. ...

http://www.ck12.org Chapter 13. Forces 13.4 Elastic Force Lesson Objectives Define elasticity and elastic force. Describe uses ...

13.4. Elastic Force http://www.ck12.org Elasticity and Elastic Force Something that is elastic can return to its original shape ...

http://www.ck12.org Chapter 13. Forces FIGURE 13.25 All these items are useful because they can be stretched and then return to ...

13.4. Elastic Force http://www.ck12.org Think Critically Explain how springs are used in scales to measure weight. Points to C ...

http://www.ck12.org Chapter 13. Forces 13.5 References Flickr:techlah. http://www.flickr.com/photos/techlah/67146616/. CC BY 2. ...

http://www.ck12.org CHAPTER 14 Newton’s Laws of Motion Chapter Outline 14.1 Newton’s First Law 14.2 NEWTON’SSECONDLAW 14.3 NEWTO ...

http://www.ck12.org Chapter 14. Newton’s Laws of Motion 14.1 Newton’s First Law Lesson Objectives State Newton’s first law of m ...

14.1. Newton’s First Law http://www.ck12.org Force and Motion Newton’s first law of motionstates that an object’s motion will no ...

http://www.ck12.org Chapter 14. Newton’s Laws of Motion keeps changing direction, but the riders keep moving in the same directi ...

14.1. Newton’s First Law http://www.ck12.org Once objects start moving, inertia keeps them moving without any additional force b ...

http://www.ck12.org Chapter 14. Newton’s Laws of Motion 14.2 Newton’s Second Law Lesson Objectives State Newton’s second law of ...