Summer Science Workshop Compound Machines How Many Teachers Does it Take to Change a Light Bulb ? Lynne M. Bailey CSD 9 Title IIB STEM Grant

Pre-Requisite If you did not complete the first simple machines workshop, visit click on Simple Machines, click Start and visit the Housewww.edheads.org How do you learn? Visit to find out – take the quiz

Agenda Paperwork Introduction Protocols Online learning style test Objectives Review Work & Machines Activities Analyzing devices Exploring online activities and resources Reflection and classroom application Share-out

Introductions Paperwork done? Protocols – leave no tracks! No food at computer stations please

What Are Machines? Devices that do work Don’t increase the amount of work done, but make work easier How? By changing the force, the distance or the direction of the force

What Makes Them Simple? Requires the application of a SINGLE force to work

Simple Machine Review Inclined Plane (Ramp) Lever Wedge Wheel & Axle Screw Pulley

Inclined Plane What simple machines are inclined planes?

Wedge What wedges do we use all the time?

Lever Bar that’s free to move about a fixed point called a fulcrum Three types F – R – E First class lever – like a see-saw. One end will lift an object up just as far as the other end is pushed down F = Fulcrum in the middle Second class lever – like a wheel barrow. Long handles are really the long arms of a lever. R = Resistance in the middle Third class lever - like a fishing pole. When the pole is given a tug, one end stays still but the other end flips in the air catching the fish. E = Effort in the middle

Wheel & Axle Rolling along – how would we transport without them? Reduce resisting force by distributing it throughout the wheel or axle, and therefore make it easier to haul loads

Screw What simpler machines make a screw? What everyday machines use screws? Online demo at ml ml Archimedes screw at crew/ScrewAnimation.html crew/ScrewAnimation.html

Pulleys How Stuff Works: Block & Tackle (pulley) s.com/pulley.htmhttp://science.howstuffwork s.com/pulley.htm Are there pulleys in the room?

Complex Machines Back to Go to Simple Machines and click on the Tool Shed for complex machines and complete the activitywww.edhead.org Let’s check out the Odd Machine nextOdd Machine

Let’s Try This Go to Inventors Toolbox at ox.html ox.html Review the different kinds of machines Continue to the Gadget Anatomy web page and complete the activity thereGadget Anatomy Group activity: Sketch your gadget!

What is it? sMachinery.htmlhttp:// sMachinery.html

What Do Machines Have To Do With Work?

What Is Work? Amount of energy transferred by a force You are doing work when you use a force to cause motion Simply, when you cause something to move, that is work To measure the amount of work you do, multiply the force times the distance the object moved. Work= Force x Distance of object moved

Inclined Plane Work Example W (Fd)= F x D Work = Your Effort Force = Object to be moved Distance = How far the object is moved ter5/ch5page.htm ter5/ch5page.htm 100 x 12’ = 400 lb X 3 feet Energy is conserved: Work Input = Work Output

Let’s Investigate Java required for this website: achine/index.htm achine/index.htm Teams conduct online experiments 1, 2 or 3 Worksheets provided for data collection

Constructing Devices These devices are often found in compound machines Gears: Jar tops, corrugated cardboard, pushpins Belt Drive: Sewing spools; pencils, screws, or dowels; ribbon, base, sandpaper; figurines and glue Cam Shaft: cut wood, cardboard tubes, dowels, glue guns Find examples of how yours is used

How Many Teachers does it take to … Design a Rube Goldberg machine If time… or on your own … construct part of the device you designed

Rube Goldberg

Exploring Resources Web page at wikipsaces.com Technoed.wikispaces.com Check the blog, for updates or my website What can you use in your classroom? How can you apply this science thread in your subject area?

Reflection and Share -out Written reflection of today’s workshop or Add a comment to the blog Questions? Tomorrow’s workshop Complete evaluation forms

Thanks for Coming! Lynne M. Bailey STEM Trainer