Inquiry & Nature of Science

Experimental Design - Div C

Bungee Drop

(section: 2 / paragraph: a / line: 2)

2015-02-13 19:51 The rules state that the bungee must terminate with "a closed metal ring approximately 1/2 to 1 inch in diameter." What constitutes approximately? Some key rings labeled as 1" are slightly over 1". Is that still acceptable?

Approximately would be 3/8" to 1 1/8".

(section: 2 / paragraph: A / line: 3)

2015-03-01 20:35 It says I can bring measuring devices and on videos I've seen calculators. Can I use a laptop for the bungee drop?

General rule #1 allows electronic items, while general rule #2 prohibits electronic devices capable of external communications. Hence, many calculators are allowed, but laptops are prohibited.

(section: 2 / paragraph: b / line: 1)

2015-02-13 19:53 Does the 500-591 mL bottle have to be specific weight/height? Or can it be any bottle, even one that is tall and thin or short and fat?

The 500 - 591 ml. bottle may be any shape. The total mass of the bottle, attachments & drop mass placed inside the bottle should be within the stated 50 - 300 gram limits.

(section: 3 / line: 2)

2015-02-13 19:54 Are dampening mechanisms such as parachutes permitted?

No, dampening mechanisms violate the spirit of the problem.

(section: 3 / paragraph: a / line: 1)

2015-03-01 20:55 What type of calculators are allowed during the 5 minute preparation time for the event?

Any type of calculators are allowed as long as they are not capable of external communication per general rule #2.

(section: 3 / paragraph: b / line: 1)

2014-11-25 20:52 What is the definition of "drop height?"is it the bottom of the plastic bottle? The top? the top including all attached pieces by the event supervisors?The height of the anchoring system's top of ledge?

The drop height is measured from the bottom of the bottle.

(section: 3 / paragraph: b / line: 3)

2014-10-21 21:08 The phrasing for the sentence beginning "An attachment mechanism... " has very confusing wording. What exactly is it saying about attachment mechanisms (could you reword it for us?)

Rule 2.b.line 3 The phrase should be a complete sentence starting with the wording "Supervisors will supply an attachment mechanism......."

(section: 3 / paragraph: c / line: 1)

2015-02-13 19:56 The cord is referred to as an "elastic cord" several times, though in this section, it refers to an elasticity test involving only the bottom 1m of the cord. Can the rest of the cord actually be non-elastic, and therefore no...

Yes, it may include non-elastic sections. All cords will stretch. Some more than others. The rules define elasticity and as long as the cord meets the elasticity test and does not violate the spirit of the problem (allowing the drop mass to free fall) it is acceptable. Please note the last sentence in the definition of the elasticity test (3.c. ..."Self-limiting-brake" mechanisms such as a separate, parallel, non-elastic strand that "brakes" the fall of the mass with little to no rebound are not permitted.)

(section: 3 / paragraph: c / line: 2)

2014-11-25 20:58 Would folding the cord in half or other fractions/multiples to adjust for drop heights considered a physical alteration?

Folding the cord would not be considered a physical alteration. However, when folded, the cord would need to meet the elasticity test. Rule 3.c states "The cord may consist of more than one material...and more than one strand as long as it meets the elasticity test." Rule 3.c also defines the elasticity test "...while being suspended vertically, the bottom meter of the cord must stretch to at least 1.25 meters when a single mass is attached to this section and return to within 5 cm of its original length after the mass is removed."

(section: 3 / paragraph: c / line: 7)

2014-11-25 20:59 Does the bottom one meter length include the key ring for the elasticity test? i.e. the one meter length measured from the bottom of the key ring.

The key ring is included in the meter for the elasticity test.

(section: 3 / paragraph: C / line: 7)

2015-04-23 18:35 The rules state that the bottom meter of the bungee cord must pass elasticity. If both the top and bottom meter of a cord passed elasticity, could I drop weights using either end?

Competitors will determine which end of the cord they wish to have tested for elasticity and attaching to the weight. Please note that the same end must be used for both activities.

Technical Problem Solving

Write It Do It - Div C

(section: 2 / paragraph: b / line: 6)

2015-02-10 21:46 Are underlines allowed to put emphasis on a word or phrase?

No, underlining is not something that can be done on a PC standard 101 key keyboard by pressing a single key or a single key in combination with the shift key.

(section: 2b / paragraph: 1 / line: 10, 20)

2015-05-08 12:07 Does use of a cartesian coordinate expression (x,y) or polar coordinate expression (distance from a point & angle reference) count as "code" if explained and defined properly according to normal mathematical context/use?

Use of cartesian coordinate expressions as you described would be acceptable.

(section: Compet / paragraph: 1 / sub-paragraph: b / line: 1)

2014-11-25 21:05 While writing can words be crossed off or erased if a mistake is made?

Yes, strikethroughs may be used to identify text that is not part of the completed instructions. Even though technically not acceptable since it cannot be made on a standard typewriter, students are not expected to perfectly write instructions and if mistakes are made, strikethroughs would identify that the text is NOT part of the written instructions ...therefore wouldn't be docked in scoring.