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Simple Machines in the Body
Transcript of Simple Machines in the Body
A simple machine is a device which does something using only one action.
What is a simple machine
Biggs, Alton. Feather, Ralph M. Rillero, Peter. Zike, Dinah. Science Level Blue. Columbus, OH, United States Of America: The McGraw-Hill Companies, Inc., 2008.
"Simple Machines-levers in the Human Body." Simple Machines-levers in the Human Body. N.d. Web. 14 Nov. 2013. <http://www.dynamicscience.com.au/tester/solutions/hydraulicus/humanbody.htm>.
Floyd, R. T. Basic Biomechanical Factors & Concepts. N.p.: n.p., n.d. Print. Chapter 3.
Bones are levers
A lever is a rod, or plank, which moves around a point, called a fulcrum. They are used to get more leverage, or power, so that less power is needed in order to make something happen.
A Baseball Bat is a lever, because it is a rod, that pivots, around your hand, which is the fulcrum.
by Juliette Houchois
Thank You for Watching
The forearm is an example of a first class lever and a third class lever, depending on the movement. The forearm is designed to have the most motion compared to force. The bones are rods, the joints are the fulcrum and the muscles provide the movement. The forearm is just one example of the levers in the body, but all bones move through a series of levers.
Teeth are wedges, because they tear apart pieces of food.
Wedges are inclined planes that move.
Such as a knife.
Wheel and Axle
An example of a wheel and axle is a doorknob. The wheel is the knob on either side of the door, and the axle is the bar that runs through the door, connecting the knobs.
An example of a wheel and axle in the body is the humerus. The humerus is the axle and the elbow and shoulder capsules are the wheels.
City Council, Brisbane. Colmslie Pool, Disabled Ramp. [Online Image] 13 July 2010. Wikimedia Commons. 10 November 2013.
Dozenist. Teeth. [Online Image] 21 January 2007. Wikimedia Commons. 10 November 2013.
Foresman, Pearson Scott. Humerus. 16 december 2007. Photograph. Wikimedia Commons, n.p.
G, Gerald. Baseball Bat. [Online Image] 13 November 2007. Wikimedia Commons. 10 November 2013. <http://commons.wikimedia.org/wiki/File:Baseball_bat.svg>
Govan, Donovan. Chef's Knife. [Online Image} 24 April 2005. Wikimedia Commons. 10 November 2013.
Rincón, César. Simple Pulley. [Online Image] 7 August 2004. Wikimedia Commons. 10 November 2013. <http://commons.wikimedia.org/wiki/File:Polea-simple-fija.jpg>