Spaghetti Bridge Challenge - Revision history

DT Online at 08:05, 23 May 2018

2018-05-23T08:05:50Z

← Older revision		Revision as of 08:05, 23 May 2018
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	<span style="color: green">'''Note:'''		<span style="color: green">'''Note:'''
	If you note the length of spaghetti used ~~and~~ press down on to small scales to take a reading, sufficient data will be recorded to be able to confirm the '''[[Young's Modulus]]''' of spaghetti - see '''[[Buckling\|Euler's Buckling Equation]]'''.		If you note the length and diameter of spaghetti used, press down on to small scales and take a reading when it starts to buckle, sufficient data will be recorded to be able to confirm the '''[[Young's Modulus]]''' of spaghetti - see '''[[Buckling\|Euler's Buckling Equation]]'''.
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	The winner is the lightest bridge which successfully spans the gap, allows a car to roll along it and carries the load as specified.		The winner is the lightest bridge which successfully spans the gap, allows a car to roll along it and carries the load as specified.

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			<span style="color: blue">'''Activity:'''
			Once completed, continue to load your model until it collapses then divide its breaking load by its self-weight using the same units - you should aim for a result between 1000 and 2000!
			</span>
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	{{Structures Buyers Guide (2)}}		{{Structures Buyers Guide (2)}}

DT Online at 10:19, 1 March 2017

2017-03-01T10:19:52Z

← Older revision		Revision as of 10:19, 1 March 2017
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	=====Some ideas:=====		=====Some ideas:=====

	Research '''[[Common Bridge Types]]''' and famous [http://wiki.dtonline.org/index.php/Common_Bridge_Types#Truss_Bridges '''Truss Bridges'''] in particular ''(e.g. [~~https~~://en.wikipedia.org/wiki/Sydney_Harbour_Bridge '''Sydney Harbour Bridge'''];[~~https~~://en.wikipedia.org/wiki/Golden_Gate_Bridge '''Golden Gate Bridge''']; [~~https~~://en.wikipedia.org/wiki/Silver_Jubilee_Bridge '''Silver Jubilee Bridge'''])'' and learn about the many variations of [~~https~~://en.wikipedia.org/wiki/Truss_bridge truss design].		Research '''[[Common Bridge Types]]''' and famous [http://wiki.dtonline.org/index.php/Common_Bridge_Types#Truss_Bridges '''Truss Bridges'''] in particular ''(e.g. [http://en.wikipedia.org/wiki/Sydney_Harbour_Bridge '''Sydney Harbour Bridge'''];[http://en.wikipedia.org/wiki/Golden_Gate_Bridge '''Golden Gate Bridge''']; [http://en.wikipedia.org/wiki/Silver_Jubilee_Bridge '''Silver Jubilee Bridge'''])'' and learn about the many variations of [http://en.wikipedia.org/wiki/Truss_bridge truss design].

DT Online at 10:18, 1 March 2017

2017-03-01T10:18:59Z

← Older revision		Revision as of 10:18, 1 March 2017
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	=====What to Use:=====		=====What to Use:=====

	* Any variety of [~~https~~://en.wikipedia.org/wiki/Spaghetti spaghetti] may be used but not [~~https~~://en.wikipedia.org/wiki/Macaroni macaroni] ''(tubular pasta)'' or [~~https~~://en.wikipedia.org/wiki/Lasagne lasagne] ''(sheet pasta)''		* Any variety of [http://en.wikipedia.org/wiki/Spaghetti spaghetti] may be used but not [http://en.wikipedia.org/wiki/Macaroni macaroni] ''(tubular pasta)'' or [http://en.wikipedia.org/wiki/Lasagne lasagne] ''(sheet pasta)''
	* Any suitable '''[[Adhesive Types\|adhesive]]''' may be used but not [~~https~~://en.wikipedia.org/wiki/Sellotape sellotape] or any other '''[[Adhesive Tapes\|adhesive tapes]]'''.		* Any suitable '''[[Adhesive Types\|adhesive]]''' may be used but not [http://en.wikipedia.org/wiki/Sellotape sellotape] or any other '''[[Adhesive Tapes\|adhesive tapes]]'''.
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	<span style="color: red">'''Safety Point!'''		<span style="color: red">'''Safety Point!'''
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	=====Things to think about:=====		=====Things to think about:=====

	Spaghetti is a [~~https~~://en.wikipedia.org/wiki/Brittleness '''brittle'''] material and very unforgiving if loaded incorrectly. Samples of spaghetti can be tested to establish that it has a '''[[Strength of Materials\|U.T.S.]]''' of around 15N/mm<sup>2</sup> and has a '''[[Young's Modulus]]''' similar to [~~https~~://en.wikipedia.org/wiki/Aluminium aluminium]. It may perform quite well if used in '''[[Tension]]''' as a '''[[Tie]]''' but is likely to fail by '''[[Buckling]]''' if subjected to '''[[Compression]]''' as a '''[[Strut]]''' ''(press a length of spaghetti down onto a hard surface to see this)''.		Spaghetti is a [http://en.wikipedia.org/wiki/Brittleness '''brittle'''] material and very unforgiving if loaded incorrectly. Samples of spaghetti can be tested to establish that it has a '''[[Strength of Materials\|U.T.S.]]''' of around 15N/mm<sup>2</sup> and has a '''[[Young's Modulus]]''' similar to [http://en.wikipedia.org/wiki/Aluminium aluminium]. It may perform quite well if used in '''[[Tension]]''' as a '''[[Tie]]''' but is likely to fail by '''[[Buckling]]''' if subjected to '''[[Compression]]''' as a '''[[Strut]]''' ''(press a length of spaghetti down onto a hard surface to see this)''.
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	<span style="color: green">'''Note:'''		<span style="color: green">'''Note:'''
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	[[File:Parts of a truss bridge.svg\|right\|400px\|Parts of a Truss Bridge\|link=~~https~~://commons.wikimedia.org/wiki/File:Parts_of_a_truss_bridge.svg]]		[[File:Parts of a truss bridge.svg\|right\|400px\|Parts of a Truss Bridge\|link=http://commons.wikimedia.org/wiki/File:Parts_of_a_truss_bridge.svg]]
	=====Some ideas:=====		=====Some ideas:=====

DT Online at 09:35, 2 January 2017

2017-01-02T09:35:04Z

← Older revision		Revision as of 09:35, 2 January 2017
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	=====What to Make:=====		=====What to Make:=====

	Design and build a bridge out of ''(uncooked!)'' spaghetti to carry a load of 1kg across a gap of 500mm using as little spaghetti as possible. The bridge must include a 50mm wide roadway which will allow a model vehicle ''(i.e. 1/50<sup>th</sup> scale approximately)'' to roll freely along it.		Design and build a bridge out of ''(uncooked!)'' spaghetti to carry a load of 1kg across a gap of 500mm using as little spaghetti as possible. The bridge must be wide enough to include a 50mm wide [[Paper and Card\|thin card]] roadway which will allow a model vehicle ''(i.e. 1/50<sup>th</sup> scale approximately)'' to roll freely along it.
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			<span style="color: green">'''Note:'''
			The card roadway and model car need not be included in the final test weighing.
			</span>
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	[[File:SpaghettiFrame.png\|right\|500px]]		[[File:SpaghettiFrame.png\|right\|500px]]
	__TOC__		__TOC__
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	=====Ways of Making:=====		=====Ways of Making:=====

	Make sketches of bridge ideas and try to work out where the forces will act, estimate their size and whether they are in '''[[~~Compr[[Category:Bridges]]ession~~]]''' or '''[[Tension]]'''.		Make sketches of bridge ideas and try to work out where the forces will act, estimate their size and whether they are in '''[[Compression]]''' or '''[[Tension]]'''.

DT Online: Added Category

2016-11-23T09:14:01Z

Added Category

← Older revision		Revision as of 09:14, 23 November 2016
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	{{Structures Buyers Guide (2)}}		{{Structures Buyers Guide (2)}}

			[[Category:Topics, Projects and Tasks]]
	[[Category:Structures Projects]]		[[Category:Structures Projects]]
	[[Category:Bridges]]		[[Category:Bridges]]

DT Online: Added Category

2016-11-01T16:00:42Z

Added Category

← Older revision		Revision as of 16:00, 1 November 2016
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	=====Ways of Making:=====		=====Ways of Making:=====

	Make sketches of bridge ideas and try to work out where the forces will act, estimate their size and whether they are in '''[[~~Compression~~]]''' or '''[[Tension]]'''.		Make sketches of bridge ideas and try to work out where the forces will act, estimate their size and whether they are in '''[[Compr[[Category:Bridges]]ession]]''' or '''[[Tension]]'''.


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	[[Category:Structures Projects]]		[[Category:Structures Projects]]
			[[Category:Bridges]]

DT Online at 09:14, 31 May 2016

2016-05-31T09:14:21Z

← Older revision		Revision as of 09:14, 31 May 2016
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	{{Structures Buyers Guide}}		{{Structures Buyers Guide (2)}}


	[[Category:Structures Projects]]		[[Category:Structures Projects]]

DT Online: Added Template

2016-05-31T09:11:07Z

Added Template

← Older revision		Revision as of 09:11, 31 May 2016
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	~~<big><big>'''~~What to Make:~~'''</big></big>~~		=====What to Make:=====

	Design and build a bridge out of ''(uncooked!)'' spaghetti to carry a load of 1kg across a gap of 500mm using as little spaghetti as possible. The bridge must include a 50mm wide roadway which will allow a model vehicle ''(i.e. 1/50<sup>th</sup> scale approximately)'' to roll freely along it.		Design and build a bridge out of ''(uncooked!)'' spaghetti to carry a load of 1kg across a gap of 500mm using as little spaghetti as possible. The bridge must include a 50mm wide roadway which will allow a model vehicle ''(i.e. 1/50<sup>th</sup> scale approximately)'' to roll freely along it.
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	The winner is the lightest bridge which successfully spans the gap, allows a car to roll along it and carries the load as specified.		The winner is the lightest bridge which successfully spans the gap, allows a car to roll along it and carries the load as specified.


			{{Structures Buyers Guide}}


	[[Category:Structures Projects]]		[[Category:Structures Projects]]

DT Online: Added link

2016-02-20T15:29:34Z

Added link

← Older revision		Revision as of 15:29, 20 February 2016
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	* Accurately weigh the completed bridge ''(i.e. to a 1/10<sup>th</sup> of a gram if possible).		* Accurately weigh the completed bridge ''(i.e. to a 1/10<sup>th</sup> of a gram if possible).
	* Support the finished bridge as shown ensuring that the gap between supports is exactly 500mm ''(e.g. use blocks of wood or house bricks for the supports)''.		* Support the finished bridge as shown ensuring that the gap between supports is exactly 500mm ''(e.g. use blocks of wood or house bricks for the supports)''.
	* Suspend the hanger from a slotted mass set below the centre of a 100mm x 50mm piece of thin ~~ply~~ or MDF which is resting on top or inside the bridge on the centre of the roadway as shown.		* Suspend the hanger from a slotted mass set below the centre of a 100mm x 50mm piece of thin '''[[Manufactured Board\|Ply]]''' or '''[[Manufactured Board\|MDF]]''' which is resting on top or inside the bridge on the centre of the roadway as shown.
	* Add the slotted masses slowly and gently to the hanger until the specified load of 1kg has been achieved ''(or not!)''. Take care to protect the surface under the bridge in case of collapse.		* Add the slotted masses slowly and gently to the hanger until the specified load of 1kg has been achieved ''(or not!)''. Take care to protect the surface under the bridge in case of collapse.

DT Online: Corrected Category

2016-01-12T18:05:24Z

Corrected Category

← Older revision		Revision as of 18:05, 12 January 2016
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	[[Category:Structures ~~Tasks~~]]		[[Category:Structures Projects]]