http://www.ck12.org Chapter 4. Motion and Forces
- Courtesy of NASA. Curvature of space and time. Public Domain
- Christopher Auyeung. Object falling off a cliff. CC BY-NC 3.0
- Laura Guerin. A well aimed shot compensates for gravity. CC BY-NC 3.0
- Laura Guerin. Aiming for the bull’s eye will cause the arrow to miss the target. CC BY-NC 3.0
- Christopher Auyeung. This cannonball is pulled down by gravity. CC BY-NC 3.0
- Zachary Wilson. Earth’s orbit is elliptical. CC BY-NC 3.0
- Christopher Auyeung and Laura Guerin. The moon orbits the earth. CC BY-NC 3.0
- Hair scrunchies: Elisa Xyz; Elastic waistband: Maegan Tintari; Rubber band: Joy Sheng; Resistance band:
Photo by Dijon Nichelle Rolle, USAG Baden-Wurttemberg. Examples of elastic objects. Hair scrunchies:
Public Domain; Elastic waistband: CC BY 2.0; Rubber band: CC BY-NC 2.0; Resistance band: CC BY 2.0 - Clare Bell (Flickr: Identity Photogr@phy). Springs also create elastic force. CC BY 2.0
- Image copyright DenisNata, 2013. Skateboarder pushing off the ground. Used under license from Shutter-
stock.com - Image copyright DenisNata, 2013. Moving skateboarder. Used under license from Shutterstock.com
- Image copyright Nikola Bilic, 2013. Skateboarder changing direction. Used under license from Shutter-
stock.com - Image copyright DenisNata, 2013. Practice problem to help students understand Newton’s first law of motion.
Used under license from Shutterstock.com - State Farm. Wearing a seat belt is important because of inertia. CC BY 2.0
- Rooney (Flickr: rooneyjohn). Skateboarder in midair. CC BY 2.0
- Image copyright Milosz Aniol, 2013. Practice problem for understanding inertia. Used under license from
Shutterstock.com - Uploaded by User:Shizhao/Wikimedia Commons. Skater exerting force. CC BY 2.5
- Image copyright Jorg Hackemann, 2013. Scooter going down ramp. Used under license from Shutter-
stock.com - Image copyright Petrenko Andriy, 2013. Practice problem calculating acceleration from force and mass. Used
under license from Shutterstock.com - Image copyright DenisNata, 2013. Practice problem for calculating weight. Used under license from Shutter-
stock.com - Christopher Auyeung. These skaters are demonstrating Newton’s third law of motion. CC BY-NC 3.0
- User:Paolakorn/It.Wikipedia. Heavier skater. CC BY 2.0
- Laura Guerin. Momentum is conserved in a collision. CC BY-NC 3.0
- Laura Guerin. Practice problem for conservation of momentum. CC BY-NC 3.0
- StockMonkeys.com (www.stockmonkeys.com). Pushpins concentrate force in a small area. CC BY 2.0
- Stefano Kocka. This break-dancer is concentrating his weight on his hand. CC BY 3.0
- Christopher Auyeung. Particles of different densities exert different amounts of pressure. CC BY-NC 3.0
- Christopher Auyeung. Diagram illustrating pressure in relation to depth. CC BY-NC 3.0
- Laszlo Ilyes (Flickr: laszlo-photo). Scuba divers need to return to the surface slowly. CC BY 2.0
- Laura Guerin. Chart of atmospheric pressure in relation to altitude. CC BY-NC 3.0
- Yamada Kazuyuki. Air pressure allows us to drink from straws. CC BY 2.0
- Laura Guerin. Air pressure allows us to breath. CC BY-NC 3.0
- Image copyright Robert Wroblewski, 2013. Pascal’s law can be illustrated with a tube of toothpaste. Used
under license from Shutterstock.com - Zachary Wilson. Hydraulic brakes utilize Pascal’s law. CC BY-NC 3.0
- Justin Taylor (Flickr: Bludgeoner86). Ketchup packet practice problem for Pascal’s law. CC BY 2.0
- Plane: Joao Carlos Medau; Hawk: Alan Vernon. Airplanes and birds fly using Bernoulli’s law. CC BY 2.0
- Christopher Auyeung. Diagram illustrating fluid pressure. CC BY-NC 3.0
- Christopher Auyeung. Diagram illustrating why some objects float and others sink. CC BY-NC 3.0
- Courtesy of Jane Peterson/NASA. Floating iceberg. Public Domain
- Christopher Auyeung. Diagram illustrating Archimedes’ Law. CC BY-NC 3.0
- Laura Guerin. Work is not done when a force is applied in a different direction than the direction of movement.