Embed Size (px)
Citation preview
What is Mission Possible?
Students design, build, test & document a Rube Goldberg-like device
Device made of sequence/series of consecutive tasks
Device must run autonomously Specific Start and End task
2
Safety Requirements/Inspection
Students must wear safety spectacles with side shields
Items not allowed Computers or digital circuitry Remote controls or timing Liquids (except water)
3
Other Potential Hazards not Allowed
Rat traps Model rocket engines Fireworks, explosives, lighters Flammable substances, matches,
candles Uncontrolled projectiles Any other hazardous materials
4
Allowed Items
Simple electric DC motors Factory sealed batteries
No more than 10.0 volts per any single electrical circuit (no lead-acid batteries)
Energy devices may be set/activated prior to starting the device (flashlights & mousetraps, not motors)
5
Requirements
Maximum Size of Machine (50 cm x 50 cm x 80 cm)
Task Sequence List Ten tasks required to earn
maximum points must contribute to the completion of the final task
No parallel sequence of tasks allowed
6
Requirements – Start Task – Task A
Device must be started by: dropping a golf ball from above
the device that will trigger a mousetrap that will begin the chain of
events leading to the final task
7
Requirements –Final Task – Task J
Raise a flagpole: With rectangular school flag
(fixed or mobile) that is at least 5 cm x 10 cm
The bottom of the flag must be at least 30 cm higher than all original parts of the device.
8
Other Details Tasks between the Start Task and
Final Task may be in any order. Additional non-listed devices, tasks,
and energy sources may be built into the device between the listed tasks but will not earn points.
Additional non-listed tasks must contribute to the completion of the final task.
9
8 Other Required Tasks (May be in any order)
Activate a photocell providing power to operate a motor.
Using a motor, turn a shaft that continuously moves a mass for at least 10 seconds, mass must trigger next action. (extra 10 points for each full sec. over 10 secs., up to 40 secs.)(300 pts. possible)
10
Other Required Tasks cont’d
Block a light source, so that it stops powering a photocell which is operating an electromagnet which releases a mass that activates the next step.
Use heat generated by the resistance in an electrical wire to melt a mono-filament line in two, so that a mass falls and activates the next step.
11
Other Required Tasks cont’d Use either pneumatics or hydraulics in an
enclosed system to operate the next action in the chain.
Use any part of the device to raise a golf ball vertically by at least 30 cm.
Pop a balloon. Use a motor with a propeller that
generates a wind that activates the next step.
12
Task Sequence List
Format What is listed? (All tasks in operation sequence) Numbering and Letter Labeling Tasks Accuracy Sequential vs. “dead ends” and “parallel paths” When to turn in TSL How many copies?
13
Tournament Day
Set up Only 30 mins. Before you plan or are
scheduled to run device Be able to explain device to judges Go through TSL Run Device Remove from testing location
14
Device Operation - Timing Timing begins when Event Supervisor says, “Go” Student drops golf ball into device to start Clock does not stop until maximum time limit of 3
minutes Tasks completed after 3 minutes will not be scored Timing stops when:
Device fails to operate Or device completes final task Or 3 minutes have elapsed
15
Device Operation – Ideal Operation Time
The Ideal operation times will be announced after impound Regional – 60 seconds State – from 60 – 90 seconds Nationals – 90 – 120 seconds
16
Device Operation – Penalties
Each touch or crossing of the imaginary box is a penalty
Students may “adjust” device but will receive penalty points
Stalling will lead to DQ Points will not be awarded for task
completion when touches or adjustments lead to the task completion
17
Scoring 2 pts - for each full second of operation up to the
“ideal” time. (max 120 at Regional) 100 pts - final task completed in 3 mins. 75 pts - Sequence Task List (STL) submitted on
time and correct format 25 pts - STL 100% accurate documentation of
device operations 50 pts – no more that 30 min. setup 25 pts – each successful required task (max 250) Max. at Regionals – 620 pts.
18
Penalties 1 point for each second the device
operates over “ideal” time (Max 120 pts) 100 pts for each motor running at start 100 pts not starting with required 1st Task 50 pts, one time, for any object that
leaves the boundary of the device (except flag & pole)
15 points for each time the device is touched, adjusted, or restarted
Tier 2 for construction violations, parallel designs or “dead end” paths
19
Things to Consider
Avoid questionable components that are too complex, too small, or not clearly visible
Device may not be timed or controlled by any remote method.
20
More Things to Consider
Final Task – the team may not complete the task themselves or make adjustments that lead directly to task completion of the next action.
Obvious stalling during ”adjustments” to gain time advantage can result in a DQ
21
Costs & Time Commitment
Inexpensive available materials Avoid the “Black Hole” theory
Where does the money go? Long term project approach In your Classroom vs. in a
student’s garage or basement Parent involvement
22
ExamplesStart Task A & Task B
Golf ball
Mousetrap
String
Light blocker
Preset light source
Photocell
Start Task –Golf ball dropped onto Mousetrap
Task B –-String attached to mousetrap pulls light blocker
-Preset light source activates photocell
-Photocell powers a motor
23
ExamplesTasks E & F
Task E –- Inside jar monofilament wire heats up and breaks
- Container inside jar falls
- empties contents into bottom of jar
- Contents mixes with water
Task F –-Chemical reaction increases air pressure
-Balloon inflates
- Inflated balloon displaces lever
- Mass moves
24
ExamplesTasks G & H
Task H – - Inflated balloon is popped.
- Weight drops
Task G –- String attached toweight goes through series of pulleys.
- String lifts golf ball
- Rising golf ball
- activates micro switch for next task.
25
ExampleFinal Task
Lengths are important, if done by this method, the fulcrum must be higher (not at the base of device) By this method the arm is too long!
5 cm (flag size) + 30 cm (above device) + 50 cm (one of max dimensions)= 85 cm (5 cm longer than max device dimension)
Hint – have string attached to highest point on the pole, you get more lifting power.
Weights or motors can be used to pull flag up.
26
