http://www.teachengineering.org/view_lesson.php?url=collection/cub_/lessons/cub_simp_machines/cub_simp_machines_lesson03.xmllessontext/xmlIntegrated Teaching and Learning Program, simple machineleverpulleywheel-and-axlemechanical advantageworkLeverMechanical AdvantagePulleySimple MachineTorqueWheel-and-AxleWork

This lesson introduces students to three of the six simple machines used by many engineers: the lever, the pulley, and the wheel-and-axle. In general, engineers use the lever to magnify the force applied to an object, the pulley to lift heavy loads over a vertical path, and the wheel-and-axle to magnify the torque applied to an object. The mechanical advantage of these machines helps determine their ability to make work easier or make work faster.

Simple machines are extremely valuable to engineers since they are used to accomplish extraordinary amounts of work with ease. In particular, engineers can design a simple machine which provides a desired mechanical advantage so that work can be done (more) efficiently and effectively. Even the most complex machines designed by engineers today are a combination of one or more of the six known simple machines. The lever, pulley and wheel-and-axle can be found in many engineered devices, such as a crowbar, crane and bicycle.Explain how the lever, pulley and wheel-and-axle make work easier.Identify how the lever, pulley and wheel-and-axle are used in many familiar engineering systems today.Discuss the mechanical advantage of a lever, pulley and wheel-and-axle.20TeachEngineering.orgJake LewisMalinda Schaefer ZarskeJanet YowellKahan, Peter. Motion, Forces, and Energy: Science Explorer Student Edition. Upper Saddle River, NJ: Prentice Hall. 2002.Macaulay, David. The way things work. Boston, MA: Houghton Mifflin Company. 1988.http://www.fhwa.dot.gov/environment/fspubs/05232810/page16.htmWoods, Michael, Woods, Mary. Ancient machines: from wedges to waterwheels. Minneapolis, MN: Runestone Press. 2000.S11416DDInternational_Technology_Education_Association-ITEA_STL_StandardsTechnologyF. Knowledge gained from other fields of study has a direct effect on the development of technological products and systems.68S11424D2ColoradoSciencea. Predict and evaluate the movement of an object by examining the forces applied to it 88S11424D3ColoradoScienceb. Use mathematical expressions to describe the movement of an object 88S1142658ColoradoMatha. Add, subtract, multiply and divide rational numbers including integers, positive and negative fractions and decimals 88S11426CFColoradoMathb. Use representations of linear functions to analyze situations and solve problems 88United StatesCopyright 2012 - Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulderhttp://www.teachengineering.org/policy_ipp.phphttp://www.teachengineering.org/2010-08-238Teacher