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All questions

Pick one, guess before you look, and the page keeps track of what you have solved on this device.

0/12 solved
1. Why a 20 kg arm only lifts 5 kgThis robot arm weighs 20 kilos. So why can it only lift five? Dynamics UR5e arm Easy labvideo 2. Turning radius of a two-wheel robotThis warehouse robot has no steering wheel. So how does it turn? Kinematics Warehouse robot Easy labvideo 3. How late can a drone brake?This drone is flying at a wall at 36 km/h. How late can it brake? Dynamics Skydio X2 Medium labvideo 4. The walk-to-run speed limitWhy can't this humanoid just walk faster? Physics sets a hard limit. Locomotion Unitree G1 Medium labvideo 5. How hard should a gripper squeeze?How hard should a robot squeeze? Too soft, it drops it. Too hard, it crushes it. Manipulation Franka Panda hand Easy labvideo 6. The steepest lean a drone can holdHow far can a drone lean before it starts to sink? Dynamics Skydio X2 Medium video 7. How far the capture point jumpsA walking robot gets shoved. Where must its next foot land? Locomotion Unitree G1 Medium video 8. Perfect in sim, falls on hardwarePerfect in simulation. Falls in two seconds on real hardware. Same policy. Why? Sim-to-real Unitree G1 Hard video 9. One joint at 1,000 degrees a secondThe hand moves at 10 cm a second. So why does one joint spin at 1,000 degrees? Kinematics UR5e arm Hard video 10. Backflip motors, sliding off a rampMotors strong enough to backflip. So why does it slide off a ramp? Dynamics Unitree Go2 Medium video 11. Hand still, elbow swingingThe hand is perfectly still. So how is the elbow swinging? Kinematics Franka Panda Hard video 12. 5 mm too high, 200 newtonsThe table is 5 mm too high. So why does the robot press with 200 newtons? Control Kinova Gen3 Medium video