1. + By: Disha & Haena

2. + What is an Elevator? Another name (lift) Call it as a transport Moves people easily Different levels of floors

3. + History of the elevator Many people invented ( B.C ) Counterweight Pulley System Elisha Graves Otis ( 1811 – 1861) Otis Safe Elevator Become famous

4. + Why was it made? Easier transportation Emergency or to not be late. Time and energy Easy way

5. + How does it work? This invention has a lot of components such as sheave, pulley, counterweight,etc…  The ropes is attached  The motor makes the car move  Counterweight http://www.vtaide.com/png/George/elevator.htm This is the picture of sheave This is the picture of pulley This is the picture of counterweight

6. + What simple machine does it use? Pulley System

7. + How do the simple machines make the work easier? For an elevator, it uses the pulley system. - Pulley : simple machine - Magnifies the force - Less effort

8. + Advantages / Disadvantages Advantages - Time - Our Energy Disadvantages - Stairs are faster - Exercise - Germs - Claustrophobia Claustrophobia

9. + One World- Social Impact Relates to people This invention is for human It changed world

10. + Bibliography "Businessman Waiting for a Slow Elevator Clipart - Royalty Free Clipart Picture." Clipart Guide.com - Clip Art, Pictures, Stock Photos, Web Graphics. N.p., n.d. Web. 20 Apr. 2011.. "Elevator." Wikipedia, the Free Encyclopedia. Web. 18 Apr. 2011..http://en.wikipedia.org/wiki/Elevator>. "Elevator - why was the elevator made?." Wikipedia, the free encyclopedia. N.p., n.d. Web. 19 Apr. 2011. <http://en.wikipedia.org/wiki/Elevator "How Does an Elevator Work?" Virtual Teacher Aide. Web. 18 Apr. 2011..http://www.vtaide.com/png/George/elevator.htm>. Leishman, Ron. Royalty-Free (RF) Clip Art Illustration of a Cartoon Confused Businessman Waiting By An Elevator. ClipartOf. http://www.clipartof.com/details/clipart/439624.html. April 19th 2011.http://www.clipartof.com/details/clipart/439624.html Morgan, Lee. "Disadvantages of Elevators | EHow.com." EHow | How to Videos, Articles & More - Trusted Advice for the Curious Life | EHow.com. Web. 20 Apr. 2011. http://www.ehow.com/list_6828149_disadvantages-elevators.html. http://www.ehow.com/list_6828149_disadvantages-elevators.html Yen ne, Bill, and Morton Grosser. 100 Inventions That Shaped World History. San Francisco, CA: Bluewood, 1993. Print. Elisha-Otis. Elevtaorhistory. Elevator