Engineering Design: Going Further

Question 1

Three cooler prototypes were tested. A: ice lasted 6 h, cost $7, mass 420 g. B: 8 h, $9, 380 g. C: 7 h, $6, 460 g. Constraints: under $8 and under 500 g. Priority: the longest ice time. Which design is chosen?

Accepted Answer

C, because it lasts longest among the designs that meet both constraints

Answer

B, because it kept ice the longest

Answer

A, because it is the lightest design that meets both constraints

Answer

Any of the three, because all three kept ice for at least 6 hours

Question 2

Three straw bridges were tested. D: held 700 g, span 30 cm, 26 straws. E: 620 g, 30 cm, 18 straws. F: 540 g, 30 cm, 20 straws. Constraints: at most 20 straws and a 30 cm span. Priority: the greatest load held. Which bridge is chosen?

Accepted Answer

E, because it holds the most load among the bridges meeting both constraints

Answer

D, because its 700 g is the greatest load any bridge held here

Answer

F, because it uses the full 20 straws the materials limit allows

Answer

Any of the three, because each one spanned the full 30 cm asked for

Question 3

Three paper towers were tested. G: 41 cm tall, stood 4 s, 12 sheets. H: 38 cm, 34 s, 14 sheets. J: 36 cm, 31 s, 20 sheets. Constraints: at most 15 sheets and at least 35 cm tall. Priority: the longest standing time. Which tower is chosen?

Accepted Answer

H, because it stands longest among the towers meeting both constraints

Answer

J, because its 20 sheets give it the sturdiest base of the three

Answer

G, because 41 cm makes it the tallest tower built in the tests

Answer

G, because a taller tower always stands longer than a shorter one

Question 4

Three lamp designs were tested. K: 900 lumens, $22, 340 g. L: 850 lumens, $17, 300 g. M: 780 lumens, $16, 380 g. Constraints: under $20 and under 350 g. Priority: the brightest lamp. K should be chosen because it is the brightest.

Accepted Answer

False

Answer

True

Question 5

Three filters were tested. F: removes 95%, $12, 9 min per liter. G: 80%, $5, 3 min. H: 90%, $8, 5 min. Constraints: at most $10 and at most 6 min per liter. Priority: the cleanest water. Which trade-off does the choice accept?

Accepted Answer

H's higher cost and slower filtering than G, in exchange for more pollutant removed

Answer

F's extra removal, in exchange for a cost and a time the limits allow

Answer

G's lower cost and faster filtering, in exchange for the cleanest water

Answer

H's faster filtering than G, in exchange for removing less pollutant

Question 6

Three model carts were tested. H: holds 900 g, mass 210 g, $9. J: 700 g, 150 g, $7. K: 850 g, 180 g, $6. Constraints: mass under 200 g and cost under $8. Priority: the greatest load held. Which cart is chosen?

Accepted Answer

K, because it holds the most load among the carts meeting both constraints

Answer

H, because 900 g is the greatest load any of the carts held

Answer

J, because its 150 g mass is the lowest mass of the three carts

Answer

J, because it is both fairly light and fairly cheap to build

Question 7

Three cups were each tested three times. Mean temperature drop in 20 min: P 4 C, Q 5 C, R 3 C. Cost: P $3, Q $2, R $6. Mass: P 90 g, Q 80 g, R 70 g. Constraints: under $5 and under 100 g. Criterion: a mean drop under 5 C. Which cup is chosen?

Accepted Answer

P, because it meets both limits and its mean drop is under 5 C

Answer

Q, because a mean drop of 5 C satisfies a criterion of under 5 C

Answer

R, because its 3 C mean drop is the smallest drop of the three cups

Answer

Q, because it is the cheapest cup and it also meets both constraints

Question 8

Three parachutes were dropped with equal loads. Fall: S 2.8 s, T 3.4 s, U 3.1 s. Canopy: S 900, T 1600, U 1200 sq cm. Mass: S 12 g, T 15 g, U 14 g. Constraints: canopy under 1500 sq cm, mass under 20 g. Priority: the slowest fall. Which is chosen?

Accepted Answer

U, because it falls most slowly among the parachutes meeting both limits

Answer

T, because its 3.4 s is the slowest fall recorded in the three drops

Answer

S, because its 900 sq cm canopy is the smallest canopy of the three

Answer

S, because its 12 g mass is the lowest mass of the three parachutes

Question 9

Three helmets pass every constraint. Impact scores: K 88, L 88, M 74. Masses: K 310 g, L 265 g, M 240 g. The stated priority is safety first, then low mass. Which helmet should the team choose?

Accepted Answer

L, because it ties for the best impact score and is lighter than K

Answer

M, because it has the lowest mass of the three

Answer

K, because a heavier helmet must absorb more impact

Answer

M, because a score of 74 is close enough to 88

Question 10

Four robot grippers meet every constraint. Grip force: P 12 N, Q 9 N, R 12 N, S 7 N. Cost: P $18, Q $10, R $11, S $9. Priority: strongest grip, then lowest cost. Which is chosen?

Accepted Answer

R, because it ties for the strongest grip and costs less than P

Answer

P, because it also reaches 12 N of grip force

Answer

S, because it costs the least of the four

Answer

Q, because it sits in the middle for both grip and cost

Question 11

Three shelters were rain-tested five times each. Mean water inside: V 3 mL, W 1 mL, X 8 mL. Cost: V $12, W $22, X $9. Mass: V 700 g, W 650 g, X 900 g. Constraints: under $20 and under 800 g. Priority: the driest inside. Which shelter is chosen?

Accepted Answer

V, because it is the driest shelter that meets both constraints

Answer

W, because its 1 mL mean is the driest result recorded in the tests

Answer

X, because its $9 cost is the cheapest of the three shelters tested

Answer

X, because an 8 mL mean is small enough to count as dry inside

Question 12

Three fans were tested. Y: airflow 60, $8, 55 dB. Z: airflow 75, $14, 50 dB. A: airflow 70, $10, 62 dB. Constraints: under $15 and under 60 dB. Priority: the greatest airflow. Z should be chosen over the cheaper fan Y.

Accepted Answer

True

Answer

False

Question 13

Roof panel materials were tested. T: surface 60 C, $30, lasts 20 years. U: 52 C, $45, 12 years. V: 55 C, $32, 18 years. The priority is the coolest surface within a $40 budget. Which material is chosen?

Accepted Answer

V, because it is the coolest surface that stays inside the budget

Answer

U, because 52 C is the coolest surface recorded

Answer

T, because it lasts the longest at 20 years

Answer

T, because it is the cheapest at $30

Question 14

Three lunch coolers were tested. B: food at 4 C, $12, 500 g. C: 3 C, $18, 480 g. D: 6 C, $9, 520 g. Constraints: at most $15 and at most 510 g. Criterion: keep food below 5 C. Which cooler is chosen?

Accepted Answer

B, because it meets both limits and keeps the food below 5 C

Answer

C, because its 3 C reading is the coldest result of the three coolers

Answer

D, because its $9 cost is the cheapest of the three coolers tested

Answer

D, because 6 C is close enough to the 5 C the criterion asks for

Question 15

Three model turbines were tested in the same wind. Spin rate: E 40, F 70, G 62 turns per minute. Cost: E $6, F $16, G $11. Mass: E 300 g, F 420 g, G 340 g. Constraints: under $15 and under 400 g. Priority: the fastest spin. Which turbine is chosen?

Accepted Answer

G, because it spins fastest among the turbines meeting both constraints

Answer

F, because 70 turns per minute is the fastest rate recorded here

Answer

E, because its $6 cost and 300 g mass are the lowest of the three

Answer

E, because a lighter turbine always spins faster than a heavy one

Question 16

Three model boats were tested. H: holds 300 g, $6, 20 cm long. J: 460 g, $12, 22 cm. K: 420 g, $8, 24 cm. Constraints: at most $10 and at most 25 cm long. Criterion: hold at least 400 g. Which boat is chosen?

Accepted Answer

K, because it meets both limits and holds at least 400 g

Answer

J, because its 460 g load is the greatest load of the three boats

Answer

H, because its $6 cost is the cheapest and it still holds 300 g

Answer

H, because 300 g is close enough to the 400 g the criterion sets

Question 17

Four bike lights were tested. Brightness: W 400, X 520, Y 520, Z 300 units. Mass: W 60 g, X 95 g, Y 70 g, Z 55 g. Constraint: under 80 g. Priority: brightest. Which light is chosen?

Accepted Answer

Y, because it is the brightest light under 80 g

Answer

X, because 520 units is the brightest reading taken

Answer

W, because it is both fairly bright and fairly light

Answer

Z, because its 55 g mass is the lowest of the four

Question 18

Three model drones were tested. L: flies 8 min, 310 g, $40. M: 7 min, 290 g, $35. N: 5 min, 260 g, $52. Constraints: under 300 g and under $45. Priority: the longest flight time. Which drone is chosen?

Accepted Answer

M, because it flies longest among the drones meeting both constraints

Answer

L, because its 8 minute flight is the longest time recorded here

Answer

N, because its 260 g mass is the lowest mass of the three drones

Answer

L, because the mass limit should be raised so the best flier passes

Question 19

Three shades were tested on sunny days. Temperature drop: P 6 C, Q 4 C, R 7 C. Cost: P $30, Q $25, R $48. Mass: P 5 kg, Q 4 kg, R 6 kg. Constraints: under $40 and under 5.5 kg. Criterion: a drop of at least 5 C. Which shade is chosen?

Accepted Answer

P, because it meets both limits and drops the temperature at least 5 C

Answer

R, because its 7 C drop is the largest temperature drop recorded

Answer

Q, because its $25 cost is the cheapest of the three shades tested

Answer

Q, because a 4 C drop is close enough to the 5 C the criterion sets

Question 20

Three packaging designs protect a jar equally well. Design A: 40 g of material, 20 s to unpack. B: 55 g, 15 s. C: 30 g, 45 s. Priority: least material, provided unpacking stays under 30 s. Which is chosen?

Accepted Answer

A, because it uses the least material among the designs unpacked in time

Answer

C, because 30 g is the least material of the three

Answer

B, because 15 s is the fastest unpacking time

Answer

B, because more material always protects the jar better

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Engineering Design: Going Further

Ways to Play

Device Games: Students play on their phones

Blast Go

Zombie Escape

Avalanche

Maze Blast

Cave Climb

Blast Out

Mystery Auction

Tour Guide

Food Truck Rush

Tug of War

Alien Blast

Glacier Rush

Board Games: Teacher-led, projected to the class

Like what you see?

Bug Blast

BlastRace

BlastQuiz

BlastBoard

Seek & Destroy

Mystery Blast

Checkers

Texas Hold 'Em

Da Bomb

Castle Siege

Hot Potato

Market Mayhem

King of the Hill

Bank Heist

Top Corner

Engineering Design: Going Further

Ways to Play

Device Games: Students play on their phones

Blast Go

Zombie Escape

Avalanche

Maze Blast

Cave Climb

Blast Out

Mystery Auction

Tour Guide

Food Truck Rush

Tug of War

Alien Blast

Glacier Rush

Board Games: Teacher-led, projected to the class

Like what you see?

More like this

Bug Blast

BlastRace

BlastQuiz

BlastBoard

Seek & Destroy

Mystery Blast

Checkers

Texas Hold 'Em

Da Bomb

Castle Siege

Hot Potato

Market Mayhem

King of the Hill

Bank Heist

Top Corner