how to build a simple roman catapult for school project?
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This place sells plans and materials: http://www.redstoneprojects.com/trebuchetstore/onager_plans.html\n\nLinks to different sites for educational catapults etc.: http://www.newton.mec.edu/Brown/TE/CATAPULTS/Catapult_links.html
253184
Wow, thats a tuff one. Have you considered cardboard or wire and fabric? How much time do you have because this seems like a time consuming task. You could look on the internet fo ideas that might help you out. It depends on what you want it to look like.
1044288
You can make any simple machine having fulcrum, load and effort or u can even make a pulley.(These r very cheap and easy to make)\n\nFor ur project on universe u can get information from any encyclopedia or search in net.
1002656
http://www.trebuchet.com/plans.html
88330
You have to start with the Jolly Roger - scull and cross bones.  Sails could be screwers and light cardboard curved with centre holes top and bottom, nicely decorated, two triangular ones at the front.  The hull could be a Plastic coke bottle cut lengthways.  Glue something heavy to the bottom and then a layer of foam for the screwers to stick into.  Fashion  cardboard to fit as a deck, make holes for the screwers.  Find some netting (stocking material or the stuff they use in fruit punnets.  Brown wool for rigging and put it all together and then caste off me hearties.
927947
build a big arc out of paper mache.\ngive the lengths of straight lines to the end of the arc. \n\nhave students gague the length by "eyeballing it"\n\nthen use a piece of rope to demonstrate the actual length..\n\n.
632762
There are various sites that explain how to build a paper blimp, just scale them up, as far as material goes you need an airtight flexible material that isnt subject to uv attack, mylar is the favorite.
240608
I don't know for sure if they have detailed plans and measurements, but I'd check out the public library. Medieval History would likely have enough drawings and sketches for you to make up your own schematic. The engineering section might have something. I think Leonarda Da Vinci had made some plans and sketches, so investigate wherever they have him filed.\n\nAnother possibility at the library is the "Stagecraft" section. Trebuchets and Onagers have surely been used enough in plays and movies to have deserved some attention.
820745
Build an abacus.  \nArrange 10 beads on a piece of piano wire.  Every fifth bead should be a different collor.\n--oo--oo0-oooo0--\nMake a few more strings and mount them together in parallel or inline with each other.\n------ooooxoooox\nooo----oxoooox--\n--ooooxoo----ooo\n\nA really cool math based model would be a display of geometric shapes.\n\nYou could go to the matherworld site and print out some patterns for the platonic solids.  Then cut them out and fold them together.  The collection can be displayed in a couple of ways.  The easiest would be to mount them on straws poking out from a block of styrofoam.  The most dramatic would be to arrange them to hang in a mobile.  If you want instructions on making a mobile, send an email to samphelps at yahoo.\n\nPlatonic solids are the 3 dimensional shapes where all the sides are the same.  The most familiar is a cube where each side is a square.  Another is the tetrahedron where each side is a triangle.
693418
Well see as though you dont really have much time for a project that involves a control... But here is an awesome listing that has loads of ideas with explicit instructions not to mention material list for a wider variety of projects. Since I have no clue what realm of science you were intrested in... This has a little bit of them all! Good Luck!\n\nhttp://school.discovery.com/sciencefaircentral/scifairstudio/ideas.html
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Its easy to make one yourself.\n\nhttp://www.graphic.org/venbas.html
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These links should do it for you.  Good luck with your project.
885871
Have an elastic material such as a rubber strap and a really firm Y-shaped material. (Any material will do, as long as it is not brittle or liable to snap).\nAttach the strap to the ends of the material and you get your catapult. For greater ease when using your catapult, find a rubber strap that is broader at the centre. It ensures a better grip on the stone/ball/whatever.\n\nHope this helps=)
685077
http://tutorialoutpost.com/\n\nThis website works wonders!!!!!!!!!!
844616
http://www.crossboweducation.com/ try this one might help
334459
Hey there!!  Good luck on your project.  Here are a few great sites to get you on your way!!\n\nhttp://www.smartdraw.com/specials/education.asp?type=41504&id=41504\n"SmartDraw is easy drawing software that provides you with an assortment of fun and creative classroom activities!\n\nShort on time, but need to create a math quiz? An astronomy handout? What about a permission slip for the museum field trip? It's all right at your fingertips with SmartDraw!\n\nSmartDraw comes packed with educational templates and clip art to help you create great-looking worksheets, forms and handouts in minutes.\n\nNot only is it quick and easy to get great results, allowing you more time for your students, but it's fun to use!"\n\nhttp://teacher.scholastic.com/tools/class_setup/\n"Class Set-Up tool is a new, easy-to-use, virtual layout tool that helps you design customized and effective classrooms to promote learning. Use this tool to rearrange and set-up mock classrooms, and map out virtual seating charts."
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I don't know what your interests are, but one experiment that I have done in the past is building an electric motor.  It's easy and does not require a lot of equipment.  I'll include the equipment list below.  If you are interested, send me an email and I will send you a picture of the setup.  That would be easier than explaining it here.\nEquipment required:\n1)Small stable platform, like a wooden board (maybe like 6 inches long and 4 inches wide, and perhaps like 1/2 inch thick).  Maybe a piece of cardboard would work as well.\n2)Magnet (something like 1 inch by 1 inch and 1/2 inch thick)\n3)Copper wire with a small diameter (something you would be able to wrap around your fingers)\n4)6-Volt battery (might be called a lantern battery). The shape of the battery is rectangular and the battery terminals look like little springs at the top of the battery.\n5)Two paper clips\n6)Two thumb tacks