"Project 7 Simple Machines"
Cornell Science Inquiry Partnerships Cornell University http://csip.cornell.edu Simple Machines Teacher’s Guide by Tom Oberst, CSIP Graduate Student Fellow, Cornell University Description This is a hands-on experiment where students take measurements and carry out a scientific procedure to explore two of the six types of simple machines: the lever and inclined plane. The experiments require the availability of spring-scales and 1kg masses. All of the other materials are basic, inexpensive, classroom materials. Subject: Physics or Physical science Grade Level: 6-9 Time required: 1-2 class periods (45-90 minutes) Background Students should have already been introduced to the six types of simple machines: wheel and axle, wedge, lever, inclined plane, pulley, and screw. Students should also be familiar with the definitions of Ideal Mechanical Advantage, Actual Mechanical Advantage, and Efficiency for each type of simple machine. Learning & Behavioral Objectives Students get hands-on experience with simple machines, and practice calculating mechanical advantage and efficiency. Students also learn laboratory and measurement techniques used in scientific experiments. National Science Education Standards Addressed Motion and forces Measurement Evidence, models and explanation Abilities of technological design Interactions of energy and matter Form and function Abilities to do scientific inquiry Assessment Strategy Students perform experiments and fill in the laboratory worksheet. This material was developed through the Cornell Science Inquiry Partnership program (http://csip.cornell.edu), with support from the National Science Foundation’s Graduate Teaching Fellows in K-12 Education (GK-12) program (DGE # 0231913 and # 9979516) and Cornell University. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF.