CK-12 Physical Science Concepts - For Middle School

4.34. Buoyancy http://www.ck12.org 4.34 Buoyancy Define buoyant force. Explain how weight and buoyant force determine whether a ...

http://www.ck12.org Chapter 4. Motion and Forces FIGURE 4.66 FIGURE 4.67 weight is less than the buoyant force acting on it, so ...

4.34. Buoyancy http://www.ck12.org could easily pick up a friend or sibling under the water. Some of the person’s weight was cou ...

http://www.ck12.org Chapter 4. Motion and Forces Explore More At the following URL, read the short article about submarines and ...

4.35. Archimedes’ Law http://www.ck12.org 4.35 Archimedes’ Law State Archimedes’ law. Explain how a heavy object such as a big ...

http://www.ck12.org Chapter 4. Motion and Forces weight of the fluid displaced by the object. This is known asArchimedes’ law(or ...

4.35. Archimedes’ Law http://www.ck12.org A: You would displace more water by stretching out your body, so there would be more b ...

http://www.ck12.org Chapter 4. Motion and Forces 4.36 Work Define work. Relate work to force and distance. The teens in the pi ...

4.36. Work http://www.ck12.org A: Regardless of the weight of the box, the man does no work on it as he holds it while walking a ...

http://www.ck12.org Chapter 4. Motion and Forces Work is directly related to both the force applied to an object and the distan ...

4.37 Calculating Work 4.37 Calculating Work Show how to calculate work from force and distance. Identify and define the SI unit ...

http://www.ck12.org Chapter 4. Motion and Forces Work = 100 N×200 m = 20,000 N • m Notice that the unit for work in the answer i ...

4.37. Calculating Work http://www.ck12.org The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals t ...

http://www.ck12.org Chapter 4. Motion and Forces 4.38 Power Define power, and relate it to work and time. Identify the SI unit ...

4.38. Power http://www.ck12.org FIGURE 4.73 Compared with a less powerful device, a more powerful device can either do more work ...

http://www.ck12.org Chapter 4. Motion and Forces Work = 1000 J/s×20 s = 20,000 J You can watch a video about calculating work an ...

4.38. Power http://www.ck12.org Explore More At the following URL, review what power means and how it is calculated. Then do the ...

http://www.ck12.org Chapter 4. Motion and Forces 4.39 Simple Machines Define machine. Describe three ways that machines make wo ...

4.39 Simple Machines A: The machine must apply the force over a shorter distance. That’s because a machine doesn’t change the am ...

http://www.ck12.org Chapter 4. Motion and Forces FIGURE 4.77 FIGURE 4.78 Simple and Compound Machines There are six types of sim ...