4.49. References http://www.ck12.org
CC BY-NC 3.0
- Laura Guerin. Examples illustrating how force and distance affect the amount of work done. CC BY-NC 3.0
- Zachary Wilson. Mower hanging on wall. CC BY-NC 3.0
- Laura Guerin. Lightbulb package. CC BY-NC 3.0
- John Lloyd (Flickr: Hugo90). A team of three horses provides 3 horsepowers of power. CC BY 2.0
- Courtesy of Justin Ward/U.S. Army Corps of Engineers. This tractor provides 180 horsepowers of power. CC
BY 2.0 - Wheel: Robert Lopez; Pliers: User:Evan-Amos/Wikimedia Commons, modified by Robert Lopez. Examples
of force increasing machine. Wheel: CC BY-NC 3.0; Pliers: Public Domain - Robert Lopez. Examples of distance increasing machines. CC BY-NC 3.0
- Robert Lopez and Laura Guerin. Examples of direction changing machines. CC BY-NC 3.0
- Zachary Wilson. The six types of simple machines, along with an example of a compound machine. CC
BY-NC 3.0 - Laura Guerin and Christopher Auyeung. Furniture being pushed up a ramp. CC BY-NC 3.0
- Zachary Wilson. Mechanical advantage for a ramp. CC BY-NC 3.0
- Image copyright Christina Richards, 2013. Object being moved up ramp. Used under license from Shutter-
stock.com - Zachary Wilson. Inclined planes with different mechanical advantages. CC BY-NC 3.0
- Zachary Wilson. Finding mechanical advantage practice. CC BY-NC 3.0
- Zachary Wilson. Diagram of a wedge at work. CC BY-NC 3.0
- Jeffrey Bary (Flickr: j_bary). Knife cutting through nuts. CC BY 2.0
- Zachary Wilson. Wedges of different shapes. CC BY-NC 3.0
- Zachary Wilson. Practice wedge problem. CC BY-NC 3.0
- Screw: Flickr:LawPrieR; Bottle: Robert Lopez (CK-12 Foundation). Examples of screws. Screw: CC BY
2.0; Bottle: CC BY-NC 3.0 - Zachary Wilson. Screws with different mechanical advantages. CC BY-NC 3.0
- Image copyright glenda, 2014. Brooms are examples of third class levers. Used under license from Shutter-
stock.com - James Lee (Flickr: jronaldlee). Doorknobs are another example of a wheel and axle. CC BY 2.0
- Zachary Wilson. Wheelbarrows consist of two simple machines. CC BY-NC 3.0
- Laura Guerin. A corkscrew contains two levers and a screw. CC BY-NC 3.0
- Christopher Auyeung. A pair of scissors consists of many simple machines. CC BY-NC 3.0