great ball contraption - a fun way to learn maths, science ... · great ball contraption - a fun...
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Great Ball Contraption -Great Ball Contraption -A Fun Way to LearnA Fun Way to Learn
Maths, Science and D&TMaths, Science and D&T
By Dr C S [email protected]
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Objective
• The GBC as a combination of variousmechanical and electrical devices, canbe used to learn Maths, Science andD&T in a fun way.
• The GBC teaches students the benefitsof co-operation, collaboration,communication and co-ordination toenhance robotics learning.
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GBC - the concept
• The GBC is the idea of SteveHassenplug, a well-known personality inthe LUGNET community.
• The concept stems from a Rube-Goldberg style contraption, only it isdone with LEGO parts.
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GBC - What is it?
• A Great Ball Contraption (GBC) consistsof a series of modules using varioustypes of mechanisms to transfer LEGOsoccer balls from one module to anotherin a never-ending fashion.
• It is difficult to describe a GBCadequately, you really have to see, andhear, one for yourself.
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GBCVer 1.0
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GBC Video
• Show video clip– long GBC2: gbcv2.mpg (3.47)
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GBC Standards
Basic moduleLinear
Turns
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GBC - it’s all up to you
• How complicated a way can youtransfer LEGO soccer balls from onebasket to another?
• Can you do it with or without anRCX/NXT controller?
• However you want to do this is entirelyup to you.
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Mechanisms
• Chain lift• Conveyor• Marble pump• Ferris wheels• Shooter• Archimedes screw
• Scissor lift• Step feeder• Elevator• Ramps• Chutes• Funnel
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And more Mechanisms
• Ski-jump• Loop: roller-coaster• Sorters• Pegboards• Flip-flops• Train
• Dumptruck• Forklift• Clockers/Smoothers• Counters• Garbage collecting• Turntable scrambler
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Rolling Ball DisplayRolling Ball DisplayClockClock
A GBC in Detail
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Inspiration
A Rolling Ball DisplayClock by Helge Rustadan electronic engineerwho lives in Trondheim,Norway.This one is built mainly ofwood.
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Overview
In this contraption, twoGBC modules arelinked together
- Chain lift
- Rolling Ball DisplayClock
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Chain Lift: Ball intake
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Ball input to clockA new ballarrives every 2minutes.
Normally, anRCX is usedto keep time.
But for demo,we speed upthe clock a bit.
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Timing Arms
1st arm counts 2 mins x 5 =10 mins2nd arm counts 10 mins x 6= 60 mins or 1 hr3rd arm counts 1 hr x 6 = 6hrs4th arm counts 6 hrs x 4 =24 hrs.
Got it?
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Return TrackAt 24:00 hrs(midnight), allthe balls willclatter down androll into the inputbasket.
Kids love towatch this.
Me, too!
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Of what use is theOf what use is theRolling Ball ClockRolling Ball Clock
besides telling the time?
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Thematic Discussion: Time
• What is time?• Why do we need to keep time?• Methods of keeping time: heart-beat,
sun, water, sand, mechanical, digital,atomic, RCX, NXT, etc.
• Arrow of time, time travel and othermysteries.
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Alien NumeracyAn alien from a distantplanet has hands asshown.In what number basewould the alien count?a) 3b) 4c) 7d) all the abovee) none of the above
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The Lesson
Getting kids to thinkthinkis more importantthan giving themthe ‘right’‘right’ answers.
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Maths• The Rolling Ball Display Clock (RBDC) is a digital
counter• It counts in different bases (5,6,6,4 in this case)• It does multiplication, too viz.
1st arm: 1 x 5 = 52nd arm: 5 x 6 = 303rd arm: 30 x 6 = 1804th arm: 180 x 4 = 720
• Thus the RBDC will count to 720 before it resets.
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Maths Quiz
What is the minimum number ofLEGO soccer balls you need forthe Rolling Ball Display Clock?
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Science
• Energy conversion• Potential energy, kinetic energy• Momentum• Friction• Levers• Moment of inertia
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D&T
• Form and function• Building strong structures• Using various mechanisms• Timing Arms - getting the correct
balance• RCX or NXT as time-keeper
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Ball input design prototype
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Timing Arm prototype
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D&T Challenge
• Build a RBDC that uses a differentarrangement of timing arms.
• If you do not have the LEGO soccerballs, build a RBDC that uses regulartable tennis (ping-pong) balls. Theseare easier to come by.
• That will keep you busy for quite awhile.
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Other configuration
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And continuation
A GBC project isopen ended.
It is never quitefinished.
You can alwaysadd anothermodule.
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GBC Benefits
• Unlike participating in competitions, a GBC isa collaborative activity encouraging theexchange of ideas and building inter-relationships among the students.
• Students have their own co-operativelearning group, and each group mustcommunicate and co-ordinate with the othergroups to accomplish the task of designingand building a total system.
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4Cs of robotics learning4Cs of robotics learning
• A GBC project will teach students toappreciate the benefits of the 4Cs4Cs– co-operation– collaboration– communication &– co-ordination
• to enhance robotics learning.