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SIMPLE MACHINES-PRINCIPLE OF LEVERAGE

SIMPLE MACHINES-PRINCIPLE OF LEVERAGE . I-Ching Lee Hao-Ting Kang Wei Ling Zheng. CONNECTION.

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SIMPLE MACHINES-PRINCIPLE OF LEVERAGE

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  1. SIMPLE MACHINES-PRINCIPLE OF LEVERAGE I-Ching Lee Hao-Ting Kang Wei Ling Zheng

  2. CONNECTION Our topic, “Simple Machines- Principle of Leverage” is related to the lecture on 10/04/2010, “Rotation- Torque”– moments of the force acting in a clockwise direction= moments of the force acting in a counterclockwise direction. On10/13/2010 , “Power and Efficiency.” – both our topic and the lecture are based on work and used the same equation:

  3. DISCOVERY Archimedes, who was born in 287 BC, 212 BC, spent a huge amount of time studying simple machines. He explained the principle of leverage and torque. “Give me a place to stand, and I shall move the earth with a lever”– Archimedes

  4. WHAT IS PRINCIPLE OF LEVERAGE?? “Leverage is defined as a small force placed in a strategic place that can bring extraordinary movement. It is a mechanical form of the principle of multiplication.” Principle of Leverage has been found by experiment where two forces are acting equally in opposite directions. F load=F effort (Load)(Load Arm)=(Effort)(Effort Arm)

  5. Also, this experiment shown that when two unequal forces were acting in opposite direction will bring about equilibrium when moment of a force is equal to other moment of a force. This established when the sum of the moments of the force acting in a clockwise direction is equal to the sum of the moments of the force acting in a counterclockwise direction. The principle of leverage can divided into three classes by the locations of the load, effort with respect to the fulcrum.

  6. CLASS I Fulcrum is located between Load and Effort. The length of the effort arm can be greater, less than, or equal to the length of the load arm. We can use less effort or more effort into the lever depends on the length of the arms. Examples: Scissors, Pliers, See-Saw, Oars on a Boat

  7. CLASS II Load is located between Effort and Fulcrum. The length of Effort Arm is greater than the length of Load Arm; therefore, we use the least effort in the Class II lever. Examples: Door, Nut Cracker, Bottle Opener

  8. CLASS III Effort is located between Load and Fulcrum. The length of the Load Arm is greater than the length of the Effort Arm; therefore, we use the most effort in Class III lever. Examples: Stapler, Hockey Stick, Broom, Tweezers, Mousetrap

  9. INSIGHT After learning this topic– Simple Machines- Principle of Leverage, we realized that there are numerous of everyday objects involving the idea of simple machines – principle of leverage. For example, where the handle locate on the door make us easy to push it, and we can lift heavy objects with less force. Many inventions of tools are based on the theory of simple machines, which make our daily life more convenience.

  10. WORK CITED: So, By Doing. "The Principle of Leverage And How To Use It In Our Life." Ready To Be Rich - Business, Investments and Personal Finance. 17 May 2008. Web. 13 Nov. 2010. <http://fitzvillafuerte.com/the-principle-of-leverage-and-how-to-use-it-in-our-life.html>. Kurtus, Ron. "Lever Is a Simple Machine - Succeed in Understanding Physics: School for Champions." School for Champions: Online Lessons for Those Seeking Success. 26 June 2008. Web. 13 Nov. 2010. <http://www.school-for-champions.com/science/machines_lever.htm>. "Discovery: Levers." Pitsco Education Online Store. Web. 13 Nov. 2010. <http://shop.pitsco.com/content/item.aspx?CategoryID=114&ap=1&art=15&bhcp=1>.

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