Packet 4: Bonus 7
The Newton–Euler method is used to solve an inverse problem named for this adjective. For 10 points each:
[10m] What adjective is paired with “chain” when describing an idealized model of a robotic arm? This adjective also partially names a quantity sometimes known as momentum diffusivity, which equals mu over density.
ANSWER: kinematic [accept kinematic chain or inverse kinematics problem or kinematic viscosity]
[10e] A robotic arm is underactuated if the number of actuators is less than the number of these things. The number of independent parameters that specify a system’s state is described with this three-word term.
ANSWER: degrees of freedom [or DOF]
[10h] The workspace of a robotic arm can be classified into a reachable workspace where every point is reachable by the end effector, and this other workspace where the end effector can reach every point with all orientations.
ANSWER: dexterous workspace [prompt on phase space]
<BC, Other Science (Engineering)> | NAFTA-Packet-4
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 38 | 12.37 | 92% | 32% | 0% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Dielectrical Materialism | Vacuous Tortoise | 10 | 10 | 0 | 20 | ME |
| Dour Straits | A Neg of Beauty is a Joy Forever | 10 | 10 | 0 | 20 | ME |
| No Country for Old Quizzers | C R A B S | 10 | 10 | 0 | 20 | ME |
| The Third Time when she was Given to Answer the Hard and the Easy, and Answered Only the Easy | H Charlson's Washed Up Scrubs | 0 | 10 | 0 | 10 | E |
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| 2026 NAFTA at Stanford | 01/17/2026 | ✓ | 4 | 15.00 | 100% | 50% | 0% |
| 2026 NAFTA at UBC | 01/17/2026 | ✓ | 2 | 15.00 | 100% | 50% | 0% |
| 2026 NAFTA at Vanderbilt | 02/14/2026 | ✓ | 3 | 16.67 | 100% | 67% | 0% |
| 2025 NAFTA at Toronto | 09/13/2025 | ✓ | 4 | 10.00 | 100% | 0% | 0% |
| 2025 NAFTA at Maryland | 09/27/2025 | ✓ | 5 | 10.00 | 80% | 20% | 0% |
| 2025 NAFTA at Harvard | 10/04/2025 | ✓ | 3 | 10.00 | 67% | 33% | 0% |
| 2025 NAFTA at Oxford | 10/11/2025 | ✓ | 4 | 17.50 | 100% | 75% | 0% |
| 2025 NAFTA at Chicago | 11/08/2025 | ✓ | 6 | 10.00 | 100% | 0% | 0% |
| 2025 NAFTA at Columbia | 11/08/2025 | ✓ | 5 | 14.00 | 100% | 40% | 0% |
| 2025 NAFTA at Richmond | 12/20/2025 | ✓ | 2 | 5.00 | 50% | 0% | 0% |