OBJECTIVES: Students will learn about simple pulley systems and how to tell the difference between a simple system and a complex pulley system. Using pulleys and weights that can be purchased at local stores, students will build simple pulley systems to demonstrate the mechanical advantages of pulleys. Students can check their knowledge by calculating the force of different pulley systems - can you make the pulley move? NATIONAL SCIENCE STANDARDS: Physical Science: Motions And Forces (5-8) Science As Inquiry: Abilities Necessary To Do Scientific Inquiry Science and Technology: Understanding About Science and Technology STANDARDS FOR TECHNOLOGY LITERACY: The Nature of Technology: Students will develop an understanding of the core concepts of technology. Design: Students will develop an understanding of engineering design. The Designed World: Students will develop an understanding of and be able to select and use transportation technologies.

LECTURE AND PREPARATION TIME: 30 minutes LESSON TIME: 15 minutes WORDS TO KNOW: equilibrium force friction mechanical advantage pulley statics vector